Circulation utilization method for light oil cracking tail gas

A light oil cracking and tail gas technology, applied in chemical instruments and methods, gas mixture processing, petroleum industry, etc., can solve problems such as environmental pollution and waste of resources

Inactive Publication Date: 2007-09-12
河北志诚化工集团有限公司
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Problems solved by technology

Because the tail gas produced by this method contains a large amount of hydrogen and a small amount of nitrogen and carbon powder, the above method not only causes serious waste of resources, but also causes environmental pollution

Method used

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  • Circulation utilization method for light oil cracking tail gas

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Effect test

Embodiment Construction

[0022] Take the production enterprise of 40,000 tons of prussic acid per year as an example, the process flow of the inventive method is as shown in Figure 1, and the process steps are:

[0023] a. Use C 5 h 12 13,000 tons of light oil, 40,000 tons of liquid ammonia, 13,000 tons of petroleum coke, the liquid ammonia is gasified with C 5 h 12 The light oil is mixed in the Venturi tube, and then heated to 250°C to 280°C by the pre-heater and enters the bottom of the cracking furnace, and the screw feeder feeds petroleum coke, and the raw material gas undergoes cracking reaction at a high temperature of 1450°C and a slight negative pressure , generating a cracked product mainly composed of hydrogen cyanide and hydrogen and containing a small amount of nitrogen and carbon powder;

[0024] b After the lysate is cooled, remove the carbon ash, enter the deammonization tower, remove unreacted ammonia with dilute sulfuric acid, then enter the water washing tower to wash off the hydr...

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Abstract

This invention relates to a circulation use method for tail gas of cracked light oil including: a, mixing light oil, liquid ammonia and petrol coke according to a weight ratio and sending them to a cracking oven for reaction, b, the cracked material is deammoniated and washed to be divided into liquid phase and gas phase, c, the gas phase is cleaned and hydrogen is collected from it, d, the collected hydrogen and nitrogen added from outside source enter into a synthesizing tower to be synthesized to liquid ammonia, e, the synthesized liquid ammonia enters into step a in circulation added with suitable ammonia from outside to make up of the total volume matching to the volume of light oil and petrol coke in step a, which fully uses tail gas generated in the production process of cracking light oil.

Description

technical field [0001] The invention relates to tail gas utilization in the production process of chemical raw materials, in particular to a tail gas utilization method in the light oil cracking process. Background technique [0002] The preparation of hydrocyanic acid and its salts by light oil cracking is a production process often used by domestic enterprises. The raw materials used in this method are light oil, liquid ammonia and petroleum coke. The process flow is usually: liquid ammonia is gasified by a gasifier, mixed with light oil and petroleum coke, and then enters a cracking furnace. Petroleum coke is used as a catalytic carrier, and the raw material gas Cracking occurs under the action of high temperature and slight negative pressure to generate hydrocyanic acid and a large amount of tail gas. At present, the tail gas produced by light oil cracking method is usually discharged directly or used as boiler fuel. Because the tail gas produced by this method contain...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G70/04C01B3/02C01C1/00C01C3/14
Inventor 周素志
Owner 河北志诚化工集团有限公司
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