Catalytic gasoline desulfurization method capable of satisfying maximum light gasoline etherification olefin reduction demands

Abstract

The invention provides a catalytic gasoline desulfurization method capable of satisfying maximum light gasoline etherification olefin reduction demands. The method comprises the following steps: after carrying out prehydrogenation treatment on catalytic gasoline, cutting into gasoline light fractions mainly composed of C5 and C6, gasoline middle fractions mainly composed of C7-C8 or C7-C9 fractions and gasoline heavy fractions; directly carrying out adsorption distillation desulfurization treatment on the light fractions in the gas state, cooling, and carrying out etherification olefin reduction for later use; carrying out extractive distillation desulfurization treatment on the gasoline middle fractions in the saturated gas phase or gas-liquid mixed phase for later use; and carrying out selective hydrotreating desulfurization on the gasoline heavy fractions, and finally, mixing with the treated light and middle fractions to obtain the deep-desulfurized catalytic gasoline. The method satisfies the requirements of the gasoline maximum etherification process, and lowers the olefins and prevents the catalytic gasoline octane number from reduction in the catalytic gasoline desulfurization process. The technique has the advantages of fewer devices and simple process. The light and middle fraction desulfurization adopt gas-phase or gas-liquid mixed phase feeding, thereby avoiding the secondary vaporization and condensation in the process from distillation cutting to distillation desulfurization, and having obvious energy-saving effects.

Description

technical field [0001] The invention belongs to the field of petrochemical industry, in particular to a catalytic gasoline desulfurization method. Background technique [0002] Automobiles have become an indispensable element in modern human life, and the air pollution caused by their emissions is becoming more and more serious, directly threatening human health. Therefore, solving the problem of motor vehicle environmental pollution has become a major task at present. Gasoline quality upgrade is one of the important methods to reduce motor vehicle emission pollution. [0003] The difficulty in upgrading the quality of gasoline is to reduce the content of sulfur and olefins, but also to ensure low octane loss and high yield of gasoline. Almost all of the sulfur and olefins in gasoline come from catalytic gasoline. Therefore, reducing the sulfur and olefin content of catalytic gasoline while ensuring low octane loss and high yield has become a difficult point in gasoline qu...

AI Technical Summary

Problems solved by technology

[0007] After the above two measures are adopted, in order to meet the national Ⅵ factory olefin standard, the olefin content in catalytic gasoline must be reduced by another 6-8 percentage points, that is, the olefin content must be reduced to below 22%; if the hydrogenation depth is simply increased to meet the olefin content requirements, the loss of octane number will be unacceptable

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