Method for producing formaldehyde through participation of distillation water of urea-formaldehyde glue in evaporation
A urea-formaldehyde glue and evaporative technology, applied in the direction of organic chemistry, can solve the problems of increased burden and high cost of sewage treatment, so as to save the cost of sewage discharge and avoid the effect of sewage discharge polluting the environment
Active Publication Date: 2014-02-19
FUJIAN YONGAN FORESTRY GRP CO LTD
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If chemical treatment is used, the cost of sewage treatment will be relatively high, which will increase the burden on the factory.
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[0012] 1. The ratio of raw materials: methanol: 1000kg / h, process water; 400kg / h, air; 1.56kg / h.
[0013] 2. Process: Collect all the distilled water from the production process of urea-formaldehyde glue and store it in a volume of about 50m 3 In the sinking glue tank 9. Use the pump to filter while transporting to the formaldehyde production line, mix with the original process water (pure soft water), and add the mixed process water to the process water inlet port 4 of the evaporator 1. Proportional raw material methanol, process water, and air enter evaporator 1, and the addition of process water is controlled at about 400kg / h by a density meter, and the temperature of evaporator 1 is adjusted at 60-70°C, so that 65°C methanol and water are evaporated. and the ternary gas of air. After the ternary gas is evaporated, it is evenly mixed in the upper part of the evaporator 1. After the ternary gas is heated and kept warm by the steam superheater (maintained above 120°C), it ...
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The invention discloses a method for producing formaldehyde through the participation of distillation water of urea-formaldehyde glue in evaporation, and relates to a method for producing the urea-formaldehyde glue and the formaldehyde. A formaldehyde production line, and a step of collecting the distillation water generated in the production of the urea-formaldehyde glue in a tail-end buffer tank are involved. The method is characterized in that: the distillation water in the tail-end buffer tank is fed to a glue precipitation tank by using a first-stage pump for glue precipitation first; then the glue precipitation tank is sequentially communicated with a glue filter, a second-stage pump, a reflux valve and a reflux port of the glue precipitation tank so as to realize the circular filtration of the distillation water; and a valve is connected with a pipeline for communicating the second-stage pump and the reflux valve through a tee joint, an outlet end of the valve is communicated with a process water inlet end pipeline of an evaporator on the formaldehyde production line, the second-stage pump pumps the distillation water into the evaporator during filtration so as to mix the distillation water with process water, and methanol in the distillation water participates in the reaction for generating the formaldehyde. The method has the advantages that: the distillation water in the production of urea-formaldehyde resin glue is recycled on the formaldehyde production line, so the environmental pollution caused by sewage discharge is avoided.
Description
Technical field: [0001] The invention relates to a method for producing urea-formaldehyde glue and formaldehyde, in particular to a method in which distilled water from the urea-formaldehyde glue participates in evaporation and is applied to formaldehyde production. Background technique: [0002] At present, in the production process of urea-formaldehyde resin glue that needs to be dehydrated, the extracted water (hereinafter referred to as distilled water) contains unreacted free aldehydes and alcohols. If the distilled water is directly discharged, it will cause biochemical oxygen consumption in the sewage. The amount of COD obviously exceeds the standard, polluting the environment. Therefore, a terminal buffer tank is set up on the production line, and the distilled water from rubber making enters the buffer tank. If chemical methods are used to treat sewage, the cost of sewage treatment will be relatively high, which will increase the burden on the factory. The compone...
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IPC IPC(8): C07C47/055C07C47/058
Inventor 毛双文吴祖顺傅加宾廖秋水王永闽
Owner FUJIAN YONGAN FORESTRY GRP CO LTD