Reprocessing system and method of Fischer-Tropsch synthetic diesel fraction

Abstract

The invention provides a reprocessing system and method of Fischer-Tropsch synthetic diesel fraction. The reprocessing system comprises a raw material buffering tank, a raw material pre-rectifying tower, a molecular sieve adsorption tower, an extract liquid feeding buffering tank, an extract liquid tower, a residual extract liquid feeding buffering tank and a residual liquid pumping tower, whereinthe raw material buffering tank receives C10 to C14 alkane fractions in a Fischer-Tropsch diesel synthesis process; the raw material pre-rectifying tower is used for pre-rectifying materials from theraw material buffering tank; the molecular sieve absorption tower absorbs and separates the material on the bottom of the raw material pre-rectifying tower; the extract liquid feeding buffering tankis used for refractionating the material of the extract liquid feeding buffering tank; the residual extract liquid feeding buffering tank receives the bottom residual extract liquid of the molecular sieve absorption tower; and the residual extract liquid tower is used for fractionating the material of the residual extract liquid feeding buffering tank. By adopting the reprocessing system and method, the C10 to C14 alkane fractions of the Fischer-Tropsch diesel synthesis process can be reprocessed, so that a product with high additional value can be obtained, the economic benefit of the Fischer-Tropsch diesel synthesis process can be increased, and the diversified development of the product can be realized.

Description

technical field [0001] The invention belongs to the field of coal chemical industry, in particular to a system and method for reprocessing Fischer-Tropsch synthetic diesel fractions. Background technique [0002] With the increasing scarcity of petroleum resources, indirect coal liquefaction technology has gradually attracted widespread attention in recent years. At present, the coal indirect liquefaction projects that have been completed and put into operation in China include Inner Mongolia Yitai 160,000 tons / year coal-to-liquids project, Shanxi Lu'an 160,000 tons / year coal-to-liquids project, Shaanxi Future Energy 1 million tons / year coal-to-liquids project and Shenhua Ningxia coal 4 million tons / year coal-to-liquid project, in addition, Inner Mongolia Yitai 2 million tons / year coal-to-liquid project, Shanxi Lu'an 1.8 million tons / year coal-to-liquid project, Yulin Yankuang 4 million tons / year Annual coal-to-liquids project and Guizhou Yufu Energy's 6 million tons / year c...

AI Technical Summary

Problems solved by technology

However, there is currently no system suitable for further processing of Fischer-Tropsch synthesis products. For example, for the C10-C14 alkane fraction in Fischer-Tropsch synthesis diesel process, it usually comes from Fischer-Tropsch synthesis hydrotreating unit and Fischer-Tropsch synthesis hydrocracking The unit is obtained by separating the hydrorefined product and the hydrocracked product through multiple separations.

At present, liquid paraffin is obtained by removing isoparaffins from the C10-C14 alkane fraction derived from the Fischer-Tropsch synthesis hydrofining unit, but it has not been fully developed to obtain finer, more diversified, and higher added value. high product

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