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agexpharma-123 · 4 years ago

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METHOD OF CLEANING WASTE WATER TO REMOVE EPICHLOROHYDRIN AND ITS CONVERSION PRODUCTS

The invention relates to a technology for wastewater treatment in chemical industries, in particular for deep wastewater treatment containing epichlorohydrin (ECP) and its conversion products formed both in its production and when used in synthesis.

Glycidol (556-52-5 ) manufacturer USA apprises of the fact that ECG is a highly toxic compound. The MPC of epichlorohydrin in water bodies is 0.01 mg / l (1 • 10 -6 %). It should be noted that epichlorohydrin is a very reactive compound and undergoes transformations in aqueous solutions to form organochlorines such as glycerol monochlorohydrin (MHG) and, in the presence of chlorides, glycerol dichlorohydrin (DHG). Both compounds are toxic: MPC in the water of water bodies of sanitary water use of MHG 0.7 mg / l (7 • 10 -5 %); DCH - 1 mg / l (1 • 10 -4 %).

Rectification of reverse epichlorohydrin also produces organochlorine wastes, which along with ECG contain MCH, DHG and various high-boiling condensation products of epichlorohydrin. Thus, it is practically impossible to provide for the exact composition of the wastewater of production associated with the use of epichlorohydrin, especially including its regeneration. In this regard, their disposal from ECG and products of its transformation is a difficult task.

A known method of two-stage biological treatment of wastewater for the production of epoxy resins [1] containing up to 300 mg / l (0.03 wt.) ECG. At the first stage, treatment is carried out for 10 hours in aeration tanks by microorganisms adapted to high concentrations of ECG. The concentration of ECG after the first stage is reduced to 100 mg / L. The second stage uses aeration tanks with conventional activated sludge. ECH cleaning efficiency is 100%. However, the method is inefficient, designed only for a specific waste composition and low ECH content in them.

The most reliable way to purify such wastewater is the hydrolysis of organochlorine compounds in an alkaline environment:

At the same time, highly toxic organochlorine compounds (ECG, MHG and DHG) are converted to harmless glycerin.

After the destruction of toxic compounds, wastewater can be diluted and discharged into the sewer or processed with the release of sodium chloride and glycerol.

A known method of wastewater treatment for the production of epoxy resins, according to which the wastewater is pretreated with an alkaline agent (NaOH, Na 2 CO 3 ) to a pH of 8-13 (preferably 12), after which the reaction mass is heated to 60-90 o C and the volatile components are distilled off . Then continue heating to 80-120 o C, preferably up to 110 o C for alkaline hydrolysis of the remaining components.

The disadvantage of this method is the contamination of the distillate with epichlorohydrin, forming a boiling azeotrope with water (boiling point 88 o C), see example No. 1.

Another disadvantage of the above method is the use when choosing a mode of neutralization of the pH. It is known that the hydrogen index changes very little in magnitude with significant changes in alkali concentration, especially in strongly alkaline media (at pH> 12). This circumstance makes optimal alkali loading difficult.

In addition, the addition of alkali to wastewater without taking into account its composition in some cases will lead to its unjustified overspending, and in others it will not provide the required treatment. So, pH 13 is reached in aqueous media already at a NaOH concentration of 0.5%, which, according to the calculation, allows the treatment of waste water containing not more than 0.44% organically bound chlorine (1.1% ECG).

However, more polluted wastewater is also known in the practice of manufacturing epoxy resins. For example, wastewater from the separation of the distilled azeotrope ECG-water contains 6.5% ECG (2.5% organically bound chlorine). And when the stratified distillate is stored together, ECG is hydrated in the aqueous phase with the formation of glycerol ionochloride, but the concentration of epichlorohydrin does not decrease due to saturation from the organic phase, and the concentration of organically bound chlorine in the aqueous solution increases significantly.

As can be seen from example No. 2, the complete purification of such wastewater from the product of hydration of ECG (monochlorohydrin) is not achieved even at pH 13.

In the production of epoxies in the presence of water-soluble aliphatic alcohols, the combined wastewater may contain more than 3% organically bound chlorine, and the water layer from the separation of the distillate isopropanol-ECG-water 4.2%.

Closest to the proposed method is a method of neutralizing wastewater for the production of glycidyl ether in accordance with which alkali is added to the wastewater to pH 12 and kept at 40 ° C for 12 hours. After processing, no harmful substances were found in the solution.

In aqueous media, a pH of 12 can be reached already at an alkali concentration of 0.01 M (0.4% NaOH).

The stoichiometry of equation (1) shows that in this case only waste water containing less than 0.05% organically bound chlorine (or 0.13% epichlorohydrin) can be neutralized.

The method has the same disadvantages as the method [1] the use of the concept of "hydrogen indicator" in the calculation of the required amount of alkali, which can lead to insufficiently deep wastewater treatment, and excessive consumption of alkali, as described above, and the possibility of use for wastewater treatment waters of only a certain composition with a relatively low content of organically bound chlorine. The disadvantage of this method is the long exposure and, therefore, low productivity.

The objective of this invention is to provide a universal method of wastewater treatment of various industries using ECG and having a different composition, with an optimal alkali consumption necessary for the hydrolysis of organochlorine compounds, and with increased productivity.

A method is proposed for treating wastewater from ECG and its conversion products, according to which alkali is added to the wastewater in a 15-50% excess of the amount required by stoichiometry for the complete hydrolysis of organically bound chlorine, and the reaction mass is maintained at a temperature of 78- 105 o C with the return of condensed vapor.

Below are examples of the proposed method (example N 4 and the table) and the methods given in the analogue (examples N 1, 2) and in the prototype (example N 3).

The content of organically bound chlorine is determined similarly to the method in GOST 22457-77. The content of organochlorine impurities is controlled by GLC with a flame ionization detector (FID). The limit of detection by ECG is 1 • 10> -4 wt.

Example No. 1 (according to the conditions of the method [1]). To 300 g of the reaction mixture containing 14.2% sodium chloride, 5.4% isopropyl alcohol and 2.9% ECG, 6.5 g of a 42% sodium hydroxide solution are added. This achieves a pH of 12.5. For 1 hour, the reaction mass is stirred at room temperature. The content of ECG in it and the pH did not change.

After raising the temperature in the reactor to 85 o C the selection of the distillate is carried out at a temperature range in pairs of 81-90 o C. The concentration of ECG in the distillate of 0.56% Example No. 2 (according to the conditions of the method [1]). To 700 ml of the aqueous phase separated after joint storage with ECG and containing 6.5% ECG and 2.0% MHG, 9.6 g of a 42% NaOH solution are added. This achieves a pH of 13.0. After raising the temperature to 100 o C, the concentration of ECG decreased to 3.2%. After 6 hours, there was no ECG in the reaction mass, MHG - 8.0% DCH 0.3% Example No. 3 (under the conditions given in the method [3]). To 700 ml of a 6% solution of ECG in water add 6.1 ml of a 42% solution of NaOH. Achieved pH of 12.2. After exposure at 40 o C for 12 hours, the solution contained 4.3% ECG, 1.8% MHG, 0.16% DHG and 0.11% glycerol.

Example No. 4 (by the proposed method). To 600 g (672 ml) of the combined liquid waste of an epoxynolac resin containing 8.1% sodium chloride, 15% isopropyl alcohol, 3% glycerol, 0.2% toluene, 8.9% epichlorohydrin, 0.9% glycerol dichlorohydrin and 0 , 2% glycerol

monochlorohydrin, add 78.6 g (54.5 ml) of a 40.4% NaOH solution. The total content of organically bound chlorine in the waste 3.6%. Achievable pH value of 13.4, an excess of alkali in relation to organically bound chlorine 15%. Then the reaction mass is brought to a boil (temperature 80 o C) and kept under reflux for 80 minutes. There are no epichlorohydrin, glycerol dichlorohydrin and glycerol monochlorohydrin in the treated waste.

Examples N 5-10 are performed analogously to example 4, and the data are summarized in table 1.

Our proposed method has significant differences from the prototype. The alkali is dosed not according to the achieved pH value, but based on the content of pollution components, determined by analysis for the mass fraction of organically bound chlorine. Alkali is taken in excess of 15-50% of the calculated amount.

After adding alkali, the reaction mass is maintained at 78-105 o C, and not at 40 o C, which reduces the exposure time (see table 1). Moreover, in the treated wastewater, not only the content of epichlorohydrin itself is controlled, but also the products of the conversion of ECG of glycerol monochlorohydrin and glycerol dichlorohydrin always accompanying it in aqueous media. The concentration of controlled impurities after cleaning is less than 1 • 10 -4 wt. which is the limit of detection on such a sensitive detector as a flame ionization detector.

It can be seen from the above examples that the methods proposed by us and the sequence of their implementation provide deep wastewater treatment from epichlorohydrin and its conversion products.

After neutralization, the wastewater can be neutralized, diluted and discharged into the sewer or processed with the release of sodium chloride and glycerol by known methods.

The addition of alkali with an excess of less than 15% creates the danger of incomplete hydrolysis of the organochlorine due to the permissible relative error in the analysis for the content of organically bound chlorine. Increasing the excess of alkali intensifies the process, however, a dosage with an excess of more than 50% is impractical, because not only leads to an excessive consumption of alkali, but in the future will require more reagent to neutralize.

The selected temperature range makes it possible to use the method for wastewater containing low boiling solvents (ethanol, isopropanol) and having a boiling point of azeotropes with water below 100 o C (see examples N 4.9, table 1), and for concentrated water-salt effluents (see example No. 6, table 1).

The advantages of the proposed method are increased productivity (due to the reduction of the exposure time when heated compared to the prototype) and the universality of the applicability for wastewater treatment of any plants using epichlorohydrin with both low and high content of epichlorohydrin and its conversion products. In this case, alkali is consumed in the optimal amount.

#S Epichlorohydrin R EpichlorohydrinR Glycidyl ButyrateS Glycidyl ButyrateR GlycidolGlycidol Agex Pharma Rampur (U.P.)

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bitcoinminershasrate · 4 years ago

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RX 570 8gb Hashrate: Mining 2021| Review| Testing | Specs | Profit

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CoinAlgorithmHashrate Ethereum (ETH)DaggerHashimoto ETH30.9 MH / SExpanse (EXP)DaggerHashimoto EXP30.9 MH / SUbiq (UBQ)Ubqhash30.9 MH / SMonero (XMR)RandomX420.0 H / SGrin (GRIN)Cuckarooz292.1 H / SRavencoin (RVN)KawPow9.0 MH / SBeam (BEAM)BeamHashIII11.0 H / S Hashrate AMD RX 570 8GB AMD RX 570 8GB Driver When installing AMD RX 570 8GB drivers, it is always recommended to uninstall the current drivers first. This way you can be sure that the DCH drivers will not be installed by Windows 10. You can download AMD RX 570 8GB drivers here . We recommend trying different driver versions. Some driver versions may cause problems during mining. Installing an older version may fix the problem. Overclocking AMD RX 570 8GB for Mining We will overclock AMD RX 570 8GB for mining using MSI Afterburner. You can find it in Yandex. The program interface is very simple, albeit a little colorful) To overclock the video card, we need two sliders: - Core Clock - overclocking by the core, increases the core frequency; - Memory Clock - memory overclocking, increases the memory frequency. You need to change the frequency values slightly. Then test the stability of the work. If all is well, then we increase the frequency even more. If the video card starts to malfunction or the drivers crash, then we just reduce the frequency and that's it. There will be no harm. Next, we'll take a look at the overclocking options for popular alogorites. Overclocking AMD RX 570 8GB for Ether To overclock AMD RX 570 8GB for mining ether or other coins using the DaggerHashimoto algorithm, you need to increase the memory frequency, and, on the contrary, lower the core to save energy. it does not affect the mining speed. Optimal overclocking parameters: ParameterMeaningCore Clock+30Memory Clock+1100 MHzPower Limit76%Temperature limit (Temp. Limit)70 ° Optimal overclocking parameters: The Radeon RX 580 and RX 570 from Asus, MSI and Sapphire in test: Consumption We used the test protocol which allows us to measure the consumption of the graphics card alone. We performed these measurements while resting on the Windows 10 desktop and in screen saver but did not integrate these latest results to make the graph more readable. Under these conditions the consumption of Radeons turns around 2-3W against 4-5W for GeForce Pascal. The consumption under load of the Radeon RX 580 and RX 570 is higher than that of the RX 480 and RX 470, which was expected in view of the specifications announced by AMD. Its partners have followed in this direction by raising the limits to give more margin to the GPU. Read the full article

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bitcoinminershasrate · 4 years ago

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RX 570 8gb Hashrate: Mining 2021| Review| Testing | Specs | Profit

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