A high-concentration methylal production process device and method
A technology of production process and process equipment, which is applied in the field of high-concentration methylal production, can solve the problems of complex extraction process, difficult extraction liquid recovery, large equipment investment, etc., achieve small investment in process equipment and technology, and reduce water resources and heat energy consumption, the effect of less by-products
Active Publication Date: 2016-03-30
JIANGSU KAIMAO PETROCHEM TECH
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Problems solved by technology
[0005] At present, 99.9% of methylal in China only has the extraction method. The extraction process is complicated, the consumption is high, and the investment in equipment is large.
Difficult recovery of extract, serious pollution
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[0022] Below in conjunction with accompanying drawing and specific embodiment, further illustrate the present invention, should be understood that these embodiments are only for illustrating the present invention and are not intended to limit the scope of the present invention, after having read the present invention, those skilled in the art will understand various aspects of the present invention Modifications in equivalent forms all fall within the scope defined by the appended claims of this application.
[0023] Such as figure 1 As shown, a production process of high-concentration methylal, first, the raw materials 37% formaldehyde and 99% methanol are mixed and preheated at 60°C and sent to the pre-reactor, and the formaldehyde formed by reaction at 60-80°C acetal and water. Then, after the reaction, the methylal and unreacted formaldehyde and methanol solutions enter the reactive distillation tower, and after reactive distillation, the temperature at the top of the tow...
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The invention discloses a high-concentration dimethoxymethane production technology device and method. The device comprises a pre-reactor, a reaction rectifying tower, a rectifying tower, an evaporative condenser, a reflux tank and a pressurized distillation tower, wherein reboilers are arranged at the bottoms of the reaction rectifying tower, the rectifying tower and the pressurized distillation tower; an outlet of the pre-reactor is connected with an inlet of the reaction rectifying tower, the top of the reaction rectifying tower is connected with an inlet of the rectifying tower, the top of the rectifying tower is sequentially connected with the evaporative condenser and the reflux tank through a pipeline, and the reflux tank is connected with an inlet of the pressurized distillation tower through a pump. The device and method are simple in technological flow, and low in technology equipment and technical investment, the concentration of the obtained dimethoxymethane can achieve more than 99.9%, the conversion rate is high and side products are fewer; in addition, through reasonable technology optimization, the consumption of water resources and heat can be greatly reduced, and the device and the method has the advantages of being energy-saving and emission-reduction.
Description
technical field [0001] The invention relates to the technical field of methylal production, in particular to the production technology of high-concentration methylal with a concentration of 99.9% or more. Background technique [0002] Methylal Acetal, also known as formaldehyde dimethyl acetal or dimethoxymethane, is a new generation of derivatives formed by the condensation of formaldehyde and methanol. It has good solubility, good compatibility with water, and is non-toxic and non-corrosive , is a new solvent recommended by the State Environmental Protection Administration, which can replace acetone, ether, benzene, toluene, xylene, chlorinated hydrocarbons, chlorofluorocarbons, etc. Widely used in cosmetics, household products, insecticides, leather products, automotive products, paints, inks and other fields. In addition, methylal is highly volatile and has good oil removal ability. It can be used as a cleaning agent and cleaning agent to reduce the emission of organic ...
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IPC IPC(8): C07C43/30C07C41/58
CPCC07C41/56C07C41/58C07C43/30Y02P20/10
Inventor 向家勇杨科岐许引张鸿伟
Owner JIANGSU KAIMAO PETROCHEM TECH