Method and system for recovering glyphosate synthesis liquid hydrolysis tail gas
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A recovery method and a technology for synthesizing liquids, applied in separation methods, chemical instruments and methods, steam condensation, etc., can solve problems such as waste of heat, waste of heat from hydrolysis steam, and excessive equipment
Pending Publication Date: 2020-06-02
ZHEJIANG XINAN CHEM INDAL GROUP
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This method can realize uninterrupted continuous production through the connection of continuous equipment, so it requires more equipment and occupies a larger area
In addition, the recovery rate of methylal in this method is low, and it needs to be condensed into a liquid state first, and then it needs to consume a large amount of steam to be heated into a vapor state when reentering the tower, which not only wastes the heat of hydrolysis steam, but also consumes a large amount of raw material. steam, causing a great waste of heat
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Embodiment 1
[0124] exist figure 2 Experiments are carried out on the recovery system of the hydrolysis tail gas of the glyphosate synthetic liquid:
[0125] Synthesize glyphosate synthetic liquid in the synthesis kettle:
[0126] The raw materials include: 5200 parts by weight of methanol, 1630 parts by weight of triethylamine, 950 parts by weight of paraformaldehyde, 1200 parts by weight of glycine and 2060 parts by weight of dimethyl phosphite.
[0127] a1) Carrying out depolymerization reaction of methanol, triethylamine and paraformaldehyde at 45°C;
[0128] a2) adding the product after the depolymerization reaction to glycine at 50°C;
[0129] a3) Condensing the product after the addition reaction with dialkyl phosphite at 50° C. to obtain a synthesis liquid.
[0130] The synthetic solution and hydrochloric acid are mixed in an acidification device (static mixer) for acidification. The acidification temperature is 50°C and the pressure is 0KPa. After acidification is complete, c...
Embodiment 2
[0139] exist figure 2 Experiments are carried out on the continuous synthesis system of the glyphosate:
[0140] Synthesize glyphosate synthetic liquid in the synthesis kettle:
[0141] The raw materials include: 5400 parts by weight of methanol, 1650 parts by weight of triethylamine, 950 parts by weight of paraformaldehyde, 1250 parts by weight of glycine and 2100 parts by weight of dimethyl phosphite.
[0142] a1) Carrying out depolymerization reaction of methanol, triethylamine and paraformaldehyde at 50°C;
[0143] a2) adding the product after the depolymerization reaction to glycine at 45°C;
[0144] a3) Condensing the product after the addition reaction with dialkyl phosphite at 45° C. to obtain a synthesis liquid.
[0145] The synthetic liquid and hydrochloric acid are mixed in an acidification device (static mixer) for acidification. The acidification temperature is 40° C. and the pressure is 5KPa. After acidification is complete, cool in an acidification cooler. ...
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Abstract
The invention relates to the technical field of glyphosate production, in particular to a method and system for recovering glyphosate synthesis liquid hydrolysis tail gas. The recovery method comprises the following steps of: carrying out primary hydrolysis reaction and secondary hydrolysis reaction on acidified glyphosate synthesis liquid, and condensing the gas subjected to secondary hydrolysisreaction to obtain condensate liquid and non-condensable gas; mixing the gas generated by the primary hydrolysis reaction, the non-condensable gas and alkali liquor, and carrying out neutralization reaction; mixing the condensate liquid with the solution subjected to the neutralization reaction, adjusting the pH value to 7.5-12, carrying out gas-liquid separation on the obtained solution and the gas obtained by the neutralization reaction, and enabling the solution and the gas obtained by the gas-liquid separation to respectively enter a dividing-wall tower; discharging methylal gas from the top of the methylal side tower, and performing condensation to obtain methylal and chloromethane crude products; discharging methanol from the top of the methanol side tower; and rectifying the mixturedischarged from the tower side of the methanol side tower to obtain methanol. The recovery method is simple in process, can effectively recover byproducts, and is low in steam consumption and low incost.
Description
technical field [0001] The invention relates to the technical field of glyphosate production, in particular to a method and system for recovering tail gas from hydrolysis of glyphosate synthesis liquid. Background technique [0002] Glyphosate is a high-efficiency, low-toxicity, broad-spectrum, destructive, non-selective herbicide with excellent biological characteristics. At present, there are two mainstream production processes of glyphosate in China: the alkyl ester method (glycine method) and the iminodiacetic acid method (IDA method). The foreign production process is mainly the iminodiacetic acid method of Monsanto Company of the United States. In my country, glyphosate is mainly produced by the alkyl ester method with glycine and dimethyl phosphite as the main raw materials. In this method, methanol is used as the reaction solvent. In the presence of catalyst triethylamine, glycine first reacts with polyoxymethylene to form N, N-dimethylolglycine is reacted with dime...
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