Method for producing liquid sodium cyanide by tailed-oil thermal-pyrolysis
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A technology of sodium cyanide and raffinate oil, applied in metal cyanide, simple alkali metal cyanide, chemical industry, etc., can solve the problems of large energy consumption, large amount of three wastes, etc., to improve conversion rate, reduce energy consumption, The effect of increasing the outlet temperature
Active Publication Date: 2010-07-14
兰州寰球工程有限公司
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This method can directly produce solid sodium cyanide, but due to the large amount of three wastes and high energy consumption, it has been eliminated
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[0022] The production method of liquid sodium cyanide product, comprises the following process steps:
[0023] ① First, put the raffinate oil (generally with a density of 600-800kg / m 3 After the raffinate oil) and liquid ammonia are vaporized and mixed at a weight ratio of 1:2 to 1:5, they are put into a high temperature cracking furnace, and the sulfur content of petroleum coke is 0.1% to 0.5%; The particle size is 10-50 mesh) as a heat carrier, and thermal cracking is carried out at 1300-1500 ° C to generate a cracked gas containing hydrocyanic acid; in order to effectively improve the conversion rate of raffinate, the temperature of the gas outlet of the high-temperature cracking furnace is resistant to It can be controlled at 700-1000℃ by adjusting the amount of cooling water in the cracking furnace.
[0024] ② The pyrolysis gas is recovered by waste heat boiler, and after decoking and cooling, hydrocyanic acid is continuously absorbed by liquid sodium hydroxide to obtain...
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Abstract
A method for producing liquefied sodium cyanide by waste oil thermal cracking is carried out by vaporizing while mixing waste oil with liquid ammonia in proportion of 1:2-1:5, putting them into cracking reactor, taking petrol coke as heat carrier, thermal cracking at 1300-1500 degree to obtain pyrolysis gas containing oxygen-hydrogen acid, recovering pyrolysis gas waste heat by waste hot boiler, removing coke, cooling, absorbing continuously by liquid sodium hydrate to obtain liquid sodium cyanide product, firing by waste gas combustion system, recovering waste heat and absorbing tail gas from liquid sodium cyanide. It's safe, convenient, cheap and controllable and has no environmental pollution.
Description
technical field [0001] The invention belongs to the technical field of chemical industry, and relates to a production process of liquid sodium cyanide, a chemical raw material, in particular to a method for producing liquid sodium cyanide by thermal cracking of raffinate oil. Background technique [0002] Cyanide series products are basic chemical raw materials with special properties and uses, and are widely used in organic synthesis, precious metal refining, electroplating, metal heat treatment, medicine, dyes, pigments, synthetic materials (such as plexiglass, nitrile rubber, etc.) , photography, etc., in addition to metal abrasives, pesticides, fumigants, reducing agents, etc. At present, it is mainly used for the production of downstream fine chemical products such as melamine, methacrylic acid series, methionine, lactic acid, DMF, etc., and the market prospect is very broad. [0003] There are four main industrial production methods of liquid sodium cyanide (molecular...
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