Recycling process and equipment for glyphosate exhaust gas absorption liquid

A technology of tail gas absorption and glyphosate, which is applied in the separation of dispersed particles, chemical instruments and methods, separation methods, etc., can solve the problems of reducing the amount of absorption liquid used, the cost of recovery, environmental protection problems, etc., so as to avoid mass production and improve absorption. Efficiency, achieve the effect of environmental protection recycling

Active Publication Date: 2014-04-02
HUBEI TAISHENG CHEM
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a recycling process for glyphosate tail gas absorption liquid, which can effectively reduce...

Method used

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  • Recycling process and equipment for glyphosate exhaust gas absorption liquid

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Lead the methyl chloride tail gas into the absorption tower 1, and the methylal aqueous solution with a mass concentration of 0.1% enters the upper part of the absorption tower and contacts the methyl chloride tail gas in the lower part of the absorption tower in countercurrent, and the flow rate of primary clean water replenishment is controlled to 40m 3 / h, the vacuum pump 5 is running, and the vacuum degree of the desorption tower 4 is stably controlled at 9.5KPa. The absorption liquid is pumped into the desorption tower 4 for circulation through the circulation pump 2. According to the content of the liquid methylal extracted from the bottom of the desorption tower 4, gradually increase the Pure methyl chloride and control the flow rate of pure methyl chloride to 100Kg / h, keep the content of methylal in the liquid extracted from the bottom of the desorption tower below 0.2%. The desorption liquid is pumped into the absorption tower 1 through the circulation pump 3 fo...

Embodiment 2

[0017] The 10% methylal dilute solution recovered by washing the exhaust gas of methyl chloride was mixed with 40 m 3 The flow rate of / h is passed in the desorption tower 4, continuously replenishes pure methyl chloride and controls the replenishment flow rate at 400Kg / h, starts the vacuum pump 5, controls the pressure of the desorption tower 4 at 5KPa, and the desorption tail gas enters the heat exchanger 6 successively after passing through the vacuum pump, and condenses 7. Control the return gas temperature of the condenser at -5°C and the condenser pressure at 120KPa (absolute pressure). The methylal and a small amount of water in the gas are condensed and separated to form a concentration of methylal with a mass concentration higher than 50%. The liquid enters the rectification tower for recycling, and the desorption liquid formed by the desorption tower with a mass concentration lower than 0.2% is supplemented to carry out washing and recovery of methyl chloride.

Embodiment 3

[0019] The methyl chloride tail gas produced by glyphosate enters the absorption tower, and the pure water enters the upper part of the absorption tower to contact the methyl chloride tail gas in the lower part of the absorption tower countercurrently. 3 / h, the amount of fresh water replenishment should ensure that the total circulation of the absorption tower is equal to the output of the absorption liquid in the absorption tower, and ensure that at least 75% of the methanol and methylal in the methyl chloride tail gas are washed down, and the methyl chloride gas after washing Entering the follow-up recovery process, the absorption liquid will contain methanol and methylal after one wash and be further recycled.

[0020] The absorption liquid after one wash in the above steps is pumped into the heat exchanger through the circulating pump, and after the absorption liquid is heated up to 28°C in the heat exchanger, it is sent to the desorption tower which is vacuumed and decomp...

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Abstract

The invention relates to recycling process and equipment for a glyphosatexhaust gas absorption liquid. Methanol and methylal in glyphosate exhaust gas are concentrated and enriched through absorption and desorption processes and recovered through condensation; after the absorption liquid is desorbed, the methanol and methylal concentration is greatly reduced and the absorption liquid as circulating absorption liquid enters an absorption tower to be recycled. According to the recycling process, the problem of low absorption efficiency of methanol and methylal in the glyphosate exhaust gas is solved, the circulating quantity of an absorbent is increased through recycling, lower concentration of the absorption liquid is kept in an absorption process, and the absorption efficiency is greatly improved; the absorbent is recycled, the complementary quantity of the absorbent is very low in the whole circulating process, and a large amount of waste liquid in a conventional treatment mode is avoided.

Description

technical field [0001] The invention relates to a process for recycling glyphosate tail gas absorbing liquid and equipment matched therewith, belonging to the technical field of chemical production. Background technique [0002] The production of glyphosate by the alkyl ester method will produce a large amount of methyl chloride tail gas. When recycling the methyl chloride tail gas, it is necessary to remove the methanol and methylal entrained in the methyl chloride tail gas through condensation and water washing. Because the equilibrium concentration that can be achieved by washing the absorption liquid is low, a large amount of clean water needs to be added, and the recovery cost of the low-concentration methanol and methylal aqueous solution produced later is relatively high, and a large amount of waste water is generated. When the temperature is high in summer and the condensation of methyl chloride tail gas cannot meet the standard, the situation will be more serious. ...

Claims

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Application Information

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IPC IPC(8): B01D53/14B01D53/18
Inventor 张昌
Owner HUBEI TAISHENG CHEM
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