Technology for recovering chloromethane washing wastewater in glyphosate production

• Main Authors: ZHU LIHUA, LIU XINLONG, YU YUHAO, MA JUN
• Format: Patent
• Language: Chinese; English
• Published: 13.07.2016
• Subjects: ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAININGELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN,SULFUR, SELENIUM OR TELLURIUM; CHEMISTRY; METALLURGY; ORGANIC CHEMISTRY

The invention provides a technology for recovering chloromethane washing wastewater in glyphosate production. The technology comprises the following steps: paraformaldehyde and dimethyl phosphite are subjected to a condensation reaction under the actions of methyl alcohol and trimethylamine; glyphosphonic acid is generated under the action of hydrochloric acid, and a large amount of tail gas containing chloromethane is produced; the tail gas is washed through a water scrubber, and gas after washing is processed through a carbon tetrachloride absorption tower; wastewater after washing is transferred into a distillation tower, the temperature is increased to 58 DEG C, and evaporated gas is collected and cooled to 20 DEG C for storage; the distillation tower is heated to 75 DEG C, and evaporated gas is collected and cooled to 15 DEG C for storage. With adoption of the technology, the chloromethane washing wastewater is subjected to recovery treatment, so that consumption of methyl alcohol in production can be re