Recovery technology for volatile oil gas in lightweight aromatic hydrocarbons filling process

A technology for light aromatic hydrocarbons and oil and gas, which is applied in the separation of dispersed particles, chemical instruments and methods, separation methods, etc., and can solve the problems of reducing process recovery efficiency and process difficulties.

Pending Publication Date: 2015-08-05
BEIJING SINO HYPRO PETROCHEM TECH +1
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Problems solved by technology

There are still some deficiencies in the patent. First, because the recovery process and operating conditions adopted are similar to the recovery process of the hydrocarbon component oil gas produced in the gasoline filling process, the recovery rate of benzene vapor only reaches more than 95%, and there is still a considerable amount of The benzene has not been recovered; secondly, because the adsorbent is activated carbon, there is a risk of safety in use; thirdly, the patent returns the condensed non-condensable gas from the intermediate storage tank to the adsorption tank, which will reduce the recovery efficiency of the entire process; in addition , it will be difficult to realize this process in many occasions without nitrogen gas after vacuuming

Method used

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  • Recovery technology for volatile oil gas in lightweight aromatic hydrocarbons filling process

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Embodiment 1

[0042] A liquid benzene car loading platform has an annual loading capacity of 150,000 tons of benzene. During the loading operation, the liquid benzene loading rate is 200t / h, the loading liquid benzene temperature is 30 °C, and the average benzene concentration during the loading process is 12v%. of benzene gas 245Nm 3 / h, the amount of benzene brought out with oil and gas is 97.1kg / h. The recovery process of the present invention is used to treat benzene gas, the adsorbent is silica gel, the vacuuming pressure is 2kpa, the vacuum stripping pressure is 4kpa, the first condensing temperature is 40°C, and the second condensing temperature is controlled at 7±1°C. The average benzene concentration of the purified tail gas after recovery and treatment by the recovery device is 3mg / m 3 , lower than the national emission standard of 12mg / m3. The amount of benzene discharged into the atmosphere with the purified tail gas=245*(1-12%)*3=647mg / h=0.000647kg / h, the benzene recovery rat...

Embodiment 2

[0044] A liquid toluene train loading platform has an annual loading capacity of 100,000 tons of toluene. During the loading operation, the liquid benzene loading rate is 300t / h, the loading liquid toluene temperature is 30 °C, and the average toluene concentration during loading is 4v%. of toluene vapour 350Nm 3 / h, the amount of toluene carried out with oil and gas is 54.5kg / h. The recovery process of the present invention is used to treat toluene oil and gas, the adsorbent is resin, the vacuuming pressure is 1kpa, the vacuum stripping pressure is 3kpa, the first condensation temperature is 40°C, and the second condensation temperature is controlled at 0°C. The purified tail gas after recovery by the recovery device Average benzene concentration 2mg / m 3 , much lower than 40mg / m 3 national emission standards. The amount of toluene discharged into the atmosphere with the purified tail gas=350*(1-4%)*2=672mg / h=0.000672kg / h, toluene recovery rate=(54.5-0.000672) / 54.5=99.998%≈...

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Abstract

The invention relates to a recovery technology for volatile aromatic hydrocarbons oil gas in filling process of lightweight aromatic hydrocarbons such as benzene, toluene, xylene and mixed aromatic hydrocarbons, a regeneration technology by combining normal pressure adsorption, vacuum desorption and vacuum cleaning is employed, the lightweight aromatic hydrocarbons after recovery is condensed to liquid by condensers of two condensing sections, and the processed purifying tail gas can satisfy a national discharge standard.

Description

technical field [0001] The invention relates to a process for recovering aromatic hydrocarbon oil and gas generated during a filling process in a light aromatic hydrocarbon storage and transportation link. To be precise, it is a kind of recovery of volatile aromatic hydrocarbon oil and gas produced in the process of loading light aromatic hydrocarbons such as benzene, toluene, xylene, and mixed aromatics into containers such as automobile tankers, train tankers, oil tankers, and storage tanks. craft. Background technique [0002] Light aromatic hydrocarbons such as benzene, toluene and xylene mixed aromatics are important industrial raw materials and are widely used in various fields of the national economy. In the storage and transportation of these light aromatic hydrocarbons, the filling process is very common. For example, light aromatic liquids such as benzene, toluene, xylene, and mixed aromatics are loaded into containers such as truck tankers, train tankers, oil tan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/047
Inventor 张国瑞李鑫钢胡小鹏崔吉星
Owner BEIJING SINO HYPRO PETROCHEM TECH
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