Extraction and rectification technology and preparation apparatus of high-density methylal
An extractive distillation and methylal technology, which is applied in the field of high-concentration methylal extractive distillation processes and preparation devices, can solve the problems of reduced methylal yield, decreased catalyst activity, loss of activity, etc., and achieves a short reaction cycle. , to achieve the effect of recycling and fast speed
Inactive Publication Date: 2015-01-21
江苏恒茂机械制造有限公司
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Problems solved by technology
At present, people often use a reactive distillation tower in the production of methylal. The catalyst is filled in the tower, and the reaction and rectification are carried out in the tower. Some impurity ions contained in the reaction mixture are easy to undergo cation exchange with the solid resin, resulting in catalyst Activity decreases or even loses activity, resulting in smaller yield and lower concentration of methylal
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[0014] 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.
[0015] The high-concentration methylal extraction and rectification process is as follows
[0016] a. Methanol and formaldehyde solutions are fully mixed in a ratio of 1.2:1 and then preheated. The preheated mixed solution undergoes a liquid phase reaction through the action of a catalyst. The reaction temperature is controlled between 45°C and 85°C. Mixtures containing methylal;
[0017] b. Heating the mixed liquid into gas, the gas forms a balanced gas-liquid two-phase through the filler, the liquid is treated as waste water, the gas is an azeotrope of methylal and methanol, and the gas is condensed;
[0018] c. Part of the liquid after gas condensation is...
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The invention relates to the technical field of methylal preparation, and especially an extraction and rectification technology and a preparation apparatus of high-density methylal. According to the invention, methanol and formaldehyde solutions are mixed in a mixed heater, and the mixture is subject to a reaction in a reactive distillation tower, such that a mixed liquid containing methylal is produced; the mixed liquid is heated, and gas in the tower top is condensed in a condenser; part of the condensate is extracted in an extraction tower; under the effect of a glycerin solvent in the extraction tower from top to bottom, methanol in the gas obtained from heated solution in the extraction tower is dispersed from gas phase to liquid phase, and high-density methylal is obtained from the tower top; liquid in the extraction tower bottom is delivered into a reclamation tower, and is separated and reused. According to the invention, a continuous technology with combined reactive distillation and extraction is adopted, and glycerin is adopted as an extractant, such that high-density methylal is produced. The reaction period is short, the speed is high, and the yield is high. With the reclamation tower, circular utilization of the solvent can be realized.
Description
technical field [0001] The invention relates to the technical field of methylal preparation, in particular to a high-concentration methylal extraction and 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 develo...
Claims
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IPC IPC(8): C07C43/30C07C41/56C07C41/58
CPCY02P20/10
Inventor 叶子茂向家勇张文祥
Owner 江苏恒茂机械制造有限公司