A continuous production process of high-quality cyanide solution and its production system

Abstract

The invention relates to a high-quality cyanide solution continuous production process and a production system of the high-quality cyanide solution, and belongs to the technical field of cyanide production. The production system comprises a metering pump, a mass flowmeter, a static mixer 7, a tube reactor 8, a gas-liquid separator 11, and pipeline valves and auto control instruments of the production system. A sampling valve 9 and a pressure auto control system 10 are arranged on a pipeline; a demister is installed inside the gas-liquid separator 11; a reaction tail gas discharging opening 12 having auto pressure control is arranged on the top of the gas-liquid separator; and a material discharging pipe and a circulating returning pipeline are arranged at the bottom of the gas-liquid separator. The method is simple; continuous production can be realize; the reaction time is short; the gas-liquid contact has no dead angle; the mass and heat transfer effects are good; the absorption rate of a raw material hydrogen cyanide is close to 100%; the aggregation discoloration caused by partial aggregation of the hydrogen cyanide gas is avoided particularly; the periodic equipment cleaning process in conventional arts is avoided especially; the labor intensity of workers is decreased; the labor force is saved; the product quality is notably improved as well; the cost is reduced by a certain degree; and accordingly the production process and the production system provided by the invention have good economic and social benefits.

Description

technical field [0001] The invention relates to a continuous production process of high-quality cyanide solution and a production system thereof, belonging to the technical field of cyanide production. Background technique [0002] Cyanide series products are basic chemical raw materials with special properties and uses. They are widely used in organic synthesis, precious metal refining, electroplating, metal heat treatment, medicine, dyes, pigments, and synthetic materials (such as plexiglass, nitrile rubber, etc.) , photography, etc. In addition, it can also be used in metal abrasives, insecticides, fumigants, reducing agents, etc., and the market prospect is very broad. [0003] Cyanide series products use hydrogen cyanide as raw material, mainly including sodium cyanide, potassium cyanide, liquid hydrocyanic acid and other products. Their main production methods are divided into tank reaction process and tower reaction process. For example, "Lanhua Science and Technolo...

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Problems solved by technology

However, this patent discloses a device that obtains liquid hydrocyanic acid through deamination, pre-cooling, dehydration, and condensation liquefaction, and uses cyanide-containing tail gas to jointly produce sodium cyanide. It does not need steam when purifying and liquefying hydrocyanic acid, which reduces production. The energy consumption of hydrocyanic acid, while the tail gas is absorbed by a series of alkali-packed absorption towers, but the yield of liquid hydrocyanic acid is low

[0009] Although the above process or equipment can satisfy the preparation of hydrocyanic acid and sodium (potassium) cyanide to a certain extent, these processes all have short mass exchange time, partial solution and Insufficient mass transfer of hydrogen cyanide gas leads to incomplete partial reaction of hydrogen cyanide, which accumulates on the wall of the reaction vessel or in the dead zone of mass exchange, polymerizes and discolors, which has a periodic or long-term impact on product quality, and is difficult to meet High-end users' requirements for continuous and stable product quality have also caused a waste of resources and brought considerable economic losses to the company

Then when absorbing with water, there is a violent mass transfer process in the above-mentioned equipment and technology, thereby causing the concentration of the hydrocyanic acid aqueous solution to be low, generally only about 2%, and then going to distill to prepare liquid hydrocyanic acid, which requires high energy consumption. The cost is high, so it is urgent to develop an excellent production process and equipment to solve these long-standing technical problems

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