Refinery rich gas pretreatment method and dry gas and/or liquefied gas desulfurization method

A liquefied gas and pretreatment technology, which is applied in the field of desulfurization of rich gas, dry gas and liquefied petroleum gas in refineries, and can solve the problems of rapid catalyst deactivation and difficult handling of sulfur
CN110628475AActive Publication Date: 2019-12-31CHINA PETROLEUM & CHEM CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
CHINA PETROLEUM & CHEM CORP
Publication Date
2019-12-31

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Abstract

The invention provides a refinery rich gas pretreatment method and a dry gas and / or liquefied petroleum gas desulfurization method. The refinery rich gas pretreatment method comprises the step of contacting the refinery rich gas with a purifying agent. The refinery rich gas pretreatment method can reduce the desulfurization load of downstream products including dry gas and liquefied gas of the refinery rich gas, reduce the environmental protection pressure of desulfurization of the dry gas and the liquefied gas and improve the desulfurization depth of the dry gas and the liquefied gas, and particularly can break through the limit of the prior art of desulfurization of the liquefied gas. The dry gas and / or liquefied gas desulfurization method can be used to carry out deep desulfurization onthe dry gas and / or liquefied gas in order to obtain dry gas and / or liquefied gas with an extremely low sulfur content.
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Description

technical field

[0001] The invention relates to the petrochemical field, in particular to a desulfurization method suitable for rich gas, dry gas and liquefied petroleum gas in refineries. Background technique

[0002] Refinery-rich gas is a collection of small molecule hydrocarbons and non-hydrocarbons, of which hydrocarbons are mainly C 1 -C 5 Alkanes and alkenes, non-hydrocarbons include sulfur-free substances such as hydrogen, nitrogen, carbon dioxide and sulfur-containing compounds such as carbonyl sulfide, hydrogen sulfide, mercaptan, carbon disulfide, dimethyl sulfide, etc. Mainly hydrogen and methyl mercaptan, hydrogen sulfide accounts for about 85% of the sulfides, followed by methyl mercaptan, accounting for about 10%, other sulfides generally do not exceed 10% of the total sulfur . The boiling point of sulfide in the rich gas of the refinery is mostly between -60°C (carbonyl sulfide) and 40°C (6.5°C for methyl mercaptan, 36.2°C for ethanethiol).

[0003] Refin...

Claims

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