Purification method of hydrocyanic acid

A purification method and technology of hydrocyanic acid, applied in the direction of cyanic acid/isocyanic acid, sustainable manufacturing/processing, climate sustainability, etc., can solve reboiler and tower body corrosion, high safety risks, and increase investment Cost and operating costs, etc., to ensure reliability, eliminate aggregation, and shorten residence time
CN102633283AInactive Publication Date: 2012-08-15CHONGQING UNISPLENDOUR CHEM
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHONGQING UNISPLENDOUR CHEM
Publication Date
2012-08-15
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a purification method of hydrocyanic acid. In the method, a purification raw material adopts 1-10% by weight of hydrocyanic acid water solution. The purification method comprises the following steps of: preheating the purification raw material to 40-60 DEG C, then introducing into a rectifying tower, adding a polymerization inhibitor, and performing distillation under the conditions that the tower top pressure is 10-90KPa negative pressure, the tower top temperature is 0-25 DEG C, the tower kettle pressure is 20-95KPa negative pressure, the tower kettle temperature is 60-100 DEG C and the reflux ratio is 3-15 so as to realize refining and purification of the hydrocyanic acid. The whole device comprises a vacuum pump which is connected with a reflux tank for operating and used for maintaining the negative pressure in the tower, and the trace hydrocyanic acid contained in exhaust gas of the vacuum pump is sent to an incinerator for incineration treatment. According to the purification method disclosed by the invention, the pressure difference between the tower top and the tower kettle is reduced, the operation temperature is reduced, the corrosion of all the devices can be avoided or reduced, and the polymerization of the hydrocyanic acid is further eliminated, thus the quality of a hydrocyanic acid product and the yield thereof are further improved; and the purification method has the characteristics that the purification method is more economic, energy-saving, environment-friendly and safer.
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Description

technical field

[0001] The present invention relates to the refining and purification of hydrocyanic acid, in particular to a method for purifying hydrocyanic acid. Background technique

[0002] Hydrocyanic acid is a weakly acidic, highly toxic, highly volatile colorless liquid, but it is also an important basic chemical substance, mainly used in the production of methyl methacrylate, adiponitrile, sodium cyanide, amino acids (such as methionine), chelating agents (EDTA, DTPA, etc.), yellow blood salt sodium / potassium, herbicides (such as glyphosate), dyes (such as indigo, etc.), medicines (such as antibiotics), fluorescent whitening agents, reactive dyes , Pesticides, etc.

[0003] There are three main methods for producing hydrocyanic acid on an industrial scale: 1) Andrussow method (Annstadt method), that is, under the action of a catalyst, methane, ammonia and air / oxygen react quickly to synthesize hydrogen cyanide gas at a high temperature of 1000-1200 °C The mixture ...

Claims

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