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High concentration methylal pressure distillation process and preparation device thereof

A technology of pressurized rectification and preparation device, which is applied in the production field of methylal and can solve the problems of not being able to obtain high-concentration products and the like

Active Publication Date: 2012-03-14
JIANGSU KAIMAO PETROCHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The current production process can only produce methylal products with a methylal concentration of 85% to 92%, and cannot obtain products with a high concentration (95% and above), which limits the application of methylal in some fields

Method used

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  • High concentration methylal pressure distillation process and preparation device thereof
  • High concentration methylal pressure distillation process and preparation device thereof

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Embodiment Construction

[0017] The present invention is described in further detail now in conjunction with accompanying drawing. These drawings are all simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, so they only show the configurations related to the present invention.

[0018] High Concentration Methylal Pressurized Distillation Process

[0019] a. Methanol and formaldehyde solutions are fully mixed in a ratio of 1.2:1, and the mixed solution is subjected to a liquid phase reaction, and the reaction temperature is controlled between 45°C and 85°C, and a mixed solution containing methylal is generated after the reaction;

[0020] b. The mixed liquid is heated to form a gas, and the gas forms a balanced gas-liquid two-phase through the action of the screen filler. The liquid is waste water containing formaldehyde, and the gas is an azeotrope of formaldehyde and methylal.

[0021] C. The azeotrope gas of formaldehyde and methyl...

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Abstract

The present invention relates to the technical field of methylal production, especially to a high concentration methylal pressure distillation process and a preparation device thereof. According to the present invention, a formaldehyde solution and a methanol solution are mixed in a mixer, and enter a pre-reactor to carry out a liquid phase reaction to generate a mixed solution containing the methylal; the mixed solution enters a reaction distillation tower to carry out a methylal treatment, such that an azeotrope containing the methylal and the methanol is generated on the top of the tower; the azeotrope enters a pressurization tower to carry out differential pressure distillation to separate the methylal and the methanol so as to obtain the high concentration methylal.

Description

technical field [0001] The invention relates to the technical field of methylal production, in particular to a high-concentration methylal pressure rectification process and a preparation device. Background technique [0002] Methylal is a colorless transparent liquid with a slight odor. It can be mixed with various reagents. It is an important chemical raw material for the synthesis of polyoxymethylene, etc. It is widely used in industries such as electronics, transportation, construction, medicine, pesticides and rubber. . As an environmentally friendly benzene-free solvent, methylal can be widely used in cosmetics, household products, industrial automotive supplies, disinfectants, etc. Insecticides, leather polishes, rubber industry, paints, inks, shoe adhesives, electronic equipment cleaners, ribbon formulations, air freshener formulations and other products have developed rapidly in recent years, especially in the field of aerosols. Very good application prospects. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D3/14C07C43/30C07C41/58
CPCY02P20/10
Inventor 叶子茂向家勇张文祥
Owner JIANGSU KAIMAO PETROCHEM TECH
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