C4 demethanol process after ether

Abstract

The present invention relates to a kind of process of demethanolization of C4 after ether. The extraction tower includes a tower body, and a plurality of supporting beams are arranged in the tower body, and each group of supporting beams is respectively arranged in parallel corresponding to each layer of trays; each of the A plurality of grooves are arranged at intervals on the support beam, and the bottom surface of each groove is provided with liquid flow holes connecting adjacent lower trays; each tray is spliced ​​by multiple sub-trays; The supporting beams in the supporting beams are arranged staggeredly; the washing liquid inlet is arranged at the upper part of the tower body, and the carbon four inlet is arranged at the lower part of the tower body; the gas phase outlet is arranged at the top of the tower, and the liquid phase outlet is arranged at the bottom of the tower. The desalted water at 35-45°C from the outside world enters the tower body from the washing liquid inlet through the desalinated water pump, and the C4 after ether enters the tower body from the C4 inlet at 35-45°C. The flow rate of the desalted water and the C4 after the ether The ratio is 1:20-25. It can remove methanol in mixed C4 with low methanol content, and the methanol content in the treated mixed C4 is not more than 50ppm, so as to reduce the consumption of sulfuric acid catalyst in the isooctane device, the energy consumption of the device and the amount of waste acid Purpose.

Description

technical field [0001] The invention relates to chemical equipment and technology, in particular to 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 product inevitably conta...

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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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