Dual-tower serially connected rectifying, separating and purifying process of hydrocyanic acid

A technology of rectifying separation and hydrocyanic acid, which is applied in the directions of cyanic acid/isocyanic acid, cyanide, inorganic chemistry, etc., can solve the problems of easy polymerization of hydrocyanic acid, harm of rectification equipment, etc. The effect of reducing energy consumption

Active Publication Date: 2015-06-24
SHANDONG XINHECHENG AMINO ACID
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] Aiming at the problem that hydrocyanic acid is easy to polymerize in the rectification process existing in the existing industrialized production of hydrocyanic acid and causes harm to rectif

Method used

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  • Dual-tower serially connected rectifying, separating and purifying process of hydrocyanic acid
  • Dual-tower serially connected rectifying, separating and purifying process of hydrocyanic acid

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Example 1 Two-tower series rectification system for separation and purification of hydrocyanic acid

[0027] Mainly comprising the first rectification tower 1 and the second rectification tower 2, the first rectification tower and the second rectification tower are packing rectification towers, the first rectification tower top is provided with a condenser 3, and the bottom of the tower is provided with a further A boiler 5 and a condenser 4 are arranged at the top of the second rectifying column, and the condensers are all partially condensed.

[0028] The crude prussic acid solution is fed into the feed port 6 at the second tray place of the first rectifying tower, and the feed liquid at the outlet port 7 of the first rectifying tower still enters the reboiler 5, and after being vaporized into a gas phase, passes through The tower bottom reflux 9 of the first rectifying tower enters the tower body, and the gaseous phase component of the first rectifying tower towe...

Embodiment 2

[0030] A double-tower series rectification separation and purification process for prussic acid, comprising the following steps:

[0031] (1) Feed

[0032] The concentration of the crude hydrocyanic acid solution is 1%-50%, preheated to a certain temperature, and fed to the second tray of the first rectification tower.

[0033] (2) Rectification and partial condensation in the first distillation column

[0034] Set the temperature at the top of the first rectification tower, the temperature of the bottom of the tower, and the pressure inside the tower. The steam at the top of the tower enters the condenser to condense. Feed at one tray.

[0035] (3) Add polymerization inhibitor

[0036] A polymerization inhibitor feeding port 17 is arranged at the top of the first rectification tower, where the polymerization inhibitor is precisely metered into the hydrogen cyanide easy-to-polymerize region, and the polymerization inhibitor is acetic acid.

[0037] (4) Distillation in th...

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Abstract

The invention relates to a dual-tower serially connected rectifying, separating and purifying process of hydrocyanic acid. The process comprises the following steps: feeding materials, rectifying in a first rectification tower, partially condensing, adding a polymerization inhibitor, rectifying in a second rectification tower, partially condensing, refluxing and separating once again. The purification process has the beneficial effects that the rectification towers are prevented from being blocked in the process of preparing hydrocyanic acid, and the operation complexity is reduced; the rectification yield is improved, a high-quality hydrocyanic acid product can be obtained, the product concentration is 99.98 percent, and residues in waste water are 0.001ppm; and the high-quality hydrocyanic acid product can be prepared from high-concentration and low-concentration hydrocyanic acid solutions by means of the process.

Description

technical field [0001] The invention belongs to the field of separation of chemical intermediates, and relates to a separation and purification process of hydrocyanic acid, in particular to a separation and purification process of hydrocyanic acid by double-tower series rectification. Background technique [0002] As an important chemical intermediate, hydrocyanic acid is more and more used to produce acrylonitrile, chelating agent, nylon and pesticides, etc., especially adiponitrile and acrylic acid have a great demand for hydrocyanic acid market space. [0003] In industrial production, the following three methods are mainly used to prepare hydrocyanic acid. The first is to produce hydrocyanic acid through the ammoxidation reaction of methane: methane, ammonia and oxygen are fully mixed according to a certain ratio and then passed into the oxidation reactor, with platinum-rhodium alloy or platinum-iridium alloy as the catalyst, under normal pressure, 1000 Reaction synthe...

Claims

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Application Information

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IPC IPC(8): C01C3/14
CPCC01C3/0295
Inventor 王志轩陈聪张立富张剑平
Owner SHANDONG XINHECHENG AMINO ACID
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