Method for producing formaldehyde by using urea-formaldehyde distillate in participation and absorption mode
A urea-formaldehyde glue and absorption-type technology, which is applied in chemical instruments and methods, preparation of organic compounds, carbon-based compounds, etc., can solve the problems of increased burden and high cost of sewage treatment, so as to save costs and avoid polluting the environment by sewage discharge Effect
Active Publication Date: 2013-11-06
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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[0011] 1. The ratio of raw materials: methanol: 1000kg / h, air: 1.56kg / h, 50-400kg / h of absorption water.
[0012] 2. Process: The raw material methanol and air are fed into the evaporator 1 in proportion through the flowmeter, and the temperature of the evaporator 1 is adjusted to 44-48°C, so that the binary gas of methanol and air at 65°C is evaporated. After the binary gas is evaporated, it is uniformly mixed in the upper part of the evaporator 1, and the ingredient steam is added to form a ternary gas. After the ternary gas is heated by a heater (maintained above 120°C), it enters the filter, is fully filtered, and enters the reactor. It reacts in the silver catalyst layer at 630-650°C to form formaldehyde gas. The generated formaldehyde gas is cooled and then absorbed into the formaldehyde solution by water in the absorption tower. Collect all the distilled water from the urea-formaldehyde rubber production process and store it in a volume of about 50m 3 In the sink 9 of the...
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The invention relates to a method for producing formaldehyde by using urea-formaldehyde distillate in a participation and absorption mode, and relates to a urea-formaldehyde glue and formaldehyde production method. The method comprises a formaldehyde production line and an end buffer tank of a urea-formaldehyde resin adhesive production line. The invention is characterized in that distillate in the end buffer tank of the urea-formaldehyde glue is sent to a glue precipitation tank by a first pump for depositing the glue; then the glue precipitation tank is successively communicated with a glue filter, a secondary pump, a reflux valve and a reflux port of the glue precipitation tank, distillate is circulated and pumped to the glue filter for filtering the residual glue; a valve is connected in a pipe which connects the secondary pump and the reflux valve through three-way tube, the valve is communicated with an absorbed water inlet pipeline at the top of an absorbing tower on the formaldehyde production line, the secondary pump is performed filtering while the distillate pumped in the absorbing tower is mixed with absorbed water, The free formaldehyde and free alcohol in distillate can be recovered through the absorbing tower. The invention has the advantages that urea-formaldehyde distillate is recovered and utilized on the formaldehyde production line and the environmental pollution caused by the sewage discharge can be avoided.
Description
Technical field: [0001] The invention relates to a production method of urea-formaldehyde glue and formaldehyde, in particular to a method for the absorption of distilled water of urea-formaldehyde glue and 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 distillate 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, an end buffer tank is set up on the production line, and the distilled water enters the buffer tank. If chemical methods are used for treatment, the cost of sewage treatment is relatively high, which will increase a lot of burden for the factory. The components in the distilled water contain a considerable par...
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IPC IPC(8): C07C47/055C07C45/38
Inventor 毛双文傅加宾吴祖顺王永闽廖秋水
Owner FUJIAN YONGAN FORESTRY GRP CO LTD