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Methylal Refining Technology

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Technology Introduction

Methaldehyde has excellent physical and chemical properties, that is good solubility, low boiling point, and water compatibility can be widely used in cosmetics, pharmaceuticals, household goods, automotive supplies, pesticides, leather polish, cleaning agents, rubber Industrial, paint, paint, ink and other products, but also because the methyl acetal has a good ability to oil and volatile, as a cleaning agent can replace F11 and F113 and chlorine solvent, it is an alternative to freon, reduce volatile organic compounds (VOCs ) Emissions of environmentally friendly production.

As the methyl acetal and water, methanol to form azeotrope, the traditional distillation method can only get about 92% of the methylaldehyde ternary azeotrope. However, in the methylal industry, in addition to part of the solvent uses 85% -93% purity, the rest need more than 99% purity of the methyl acetal products. At present, the industrial formaldehyde refining methods are mainly salt distillation, liquid-liquid extraction, ion exchange, adsorption and pressure distillation method. The characteristics of these methods are summarized as follows:





Salt distillation method

The separation process is complex and the    operation is demanding
    Waste treatment is complex, has been gradually    eliminated


Liquid - liquid extraction

Through the introduction of the third    component refined methyl acetal, need to supporting the extraction agent    recovery device
    Disadvantages: equipment investment,    operational energy consumption, the introduction of new impurities into the    product


Ion    exchange method

The crude acetal crude product has passed    the strong alkaline anion exchange resin column, strong acid cation exchange    resin column to obtain high purity products
    Disadvantages: limited processing    capacity, resin recycling costs are high


Adsorption method

The separation of the alcohol and methyl    acetal by molecular sieve was used to separate high purity methylal
    Disadvantages: limited handling capacity,    one-time investment in adsorbents and high regeneration costs


Transformed distillation

The use of atmospheric pressure and high    pressure, methyl acetal/methanol/water azeotropic composition changes, to    achieve methylal refining
    The separation efficiency of the    equipment is relatively high

Our company's methyl acetal technology, according to the customer's requirements for the purity of methyl acetal products to pressure-based distillation to add the method to add.

Glyphosate by-product 50,000 tons / year acetal refining device as an example.

Technical Features


Process Flow

Reference Plant


Jiangsu Huda Chemical Technology Co., Ltd. (Hubei Sanli Fengxiang Technology Co., Ltd.) is a young technology company specialized in providing EPC contracting service and the import & export of chemical plants
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