Extraction tower and process for removing methanol from residual C4 of etherification reaction

Abstract

The invention relates to an extraction tower and a process for removing methanol from residual C4 of an etherification reaction. The extraction tower comprises a tower body which is internally provided with a plurality of supporting beams; each group of supporting beams corresponds to one layer of tower plate in parallel; a plurality of grooves are formed in each supporting beam at intervals; liquid flow holes communicated with the adjacent lower layer of tower plate are formed in the bottom surfaces of the grooves; each layer of tower plate is formed by splicing a plurality of secondary tower plate pieces; the supporting beams in each two adjacent groups are arranged in a staggered manner; a washing liquid inlet is formed in the upper part of the tower body and a C4 inlet is formed in the lower part of the tower body; a gas-phase outlet is formed in the tower top, and a liquid-phase outlet is formed in the tower bottom. Desalted water which is taken from the outside and has the temperature of 35-45 DEG C enters the tower body from the washing liquid inlet through a desalted water pump, residual C4 of the etherification reaction, which has the temperature of 35-45 DEG C, enters the tower body from the C4 inlet, and the flow ratio of the washing liquid to residual C4 of the etherification reaction is 1 to (20-25). Methanol in mixed C4 with the low methanol content can be removed and the content of methanol in processed mixed C4 is not more than 50ppm so that the consumption amount of a sulfuric acid catalyst in an isooctane device, the energy consumption of the device and the amount of waste acids can be reduced.

Description

technical field [0001] The invention relates to chemical equipment and technology, in particular to an extraction tower and a C4 demethanol technology after ether. Background technique [0002] Sulfuric acid alkylation to prepare isooctane is to mix isobutane and butene in C4 (C4) as raw material, use 89%-98% sulfuric acid as catalyst, and generate octane gasoline group by liquid phase reaction at low temperature Sub-alkylation oil processing technology. The sulfuric acid concentration is controlled between 89%-98%, because although the higher the sulfuric acid concentration, the higher the activity, the higher the yield and the better the quality of the alkylated oil. Usually, carbon four (C4) separated from catalytic cracking liquid hydrocarbons by gas rectification is used as a raw material, and such raw materials can be used directly. [0003] But for the post-ether C4 raw material, since the raw material for its preparation contains methanol, the post-ether C4 in the ...

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Problems solved by technology

[0004] Existing extraction towers for C4 demethanol are usually used to process C4 raw materials with a large methanol content. After methanol removal, the methanol content in C4 raw materials will still reach 1000ppm or more, which cannot meet the requirements of isooctane units.

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