Alkyl ester method glyphosate solvent recovery system and process
A recovery system and glyphosate technology, applied in the chemical industry, separation methods, chemical instruments and methods, etc., can solve the problems of poor intrinsic safety, low energy consumption of phase transition, poor operation stability, etc., to avoid large logistics load, Improves intrinsic safety and reduces system stress
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[0035] Example 1
[0036] A solvent recovery system for the production of glyphosate by alkyl ester method, comprising a dilute methanol solution collection tank 8, a primary distillation tower 9, a methanol methylal solution intermediate tank 13, and a secondary distillation tower 14;
[0037] The glyphosate hydrolysis tail gas pretreatment system produced by the alkyl ester method is connected to the dilute methanol solution collection tank 8. The dilute methanol solution collection tank 8 is connected to the upper part of the primary distillation tower 9 through a pipeline, and the top of the primary distillation tower 9 is condensed A device 10 is connected to a reflux tank 12, and the bottom of the primary distillation tower 9 is connected to the sewage station 20;
[0038] The reflux tank 12 is connected with the methanol methylal solution intermediate tank 13;
[0039] The methanol methylal solution intermediate tank 13 is connected to the secondary rectification tower 14 via a...
Example Embodiment
[0049] Example 2
[0050] A pressure-controlled solvent recovery process for glyphosate produced by alkyl ester method based on the above system, and its specific steps and features are as follows:
[0051] Neutralization and pressure control steps: the mixture of hydrogen chloride, methyl chloride, methanol, methylal, and water vapor from the glyphosate hydrolysis station enters the tail gas neutralization tower together with liquid caustic so as to be neutralized to a pH of 7-10, and the tail gas is removed The acidic components in the gas will then enter the tail gas condenser for condensation and separation after pressure control, the condensate will go to the dilute methanol solution collection tank, and the non-condensable gas will go to the methyl chloride recovery device.
[0052] The pressure of the system where the exhaust gas condenser, the dilute methanol solution collection tank and its pressure balance pipe are controlled by compressor one and compressor two is 0.1-0.4M...
Example Embodiment
[0059] List examples:
[0060] When the selected system pressure P is 0.4MPa and the control system temperature T is in the range of 13-88°C, the above separation effect is achieved.
[0061] When the selected system pressure P is 0.3MPa, the separation requirement can be achieved by controlling the system temperature T in the range of 5-78℃. To give a further example, when the control system pressure P=0.3MPa and the system temperature T is 76-78°C, the water, methanol, and methylal in the tail gas will condense, while the methyl chloride will not be condensed, and the water and methanol in the tail gas will be realized. , Separation of methylal and methyl chloride. The condensate with a temperature of 76-78℃ enters the dilute methanol solution collection tank, and then throttles and reduces to normal pressure (0.1MPa). At this pressure and temperature, the methylal and methanol in the dilute methanol solution enter the first stage The rectification tower vaporizes instantly (th...
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