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Heat pump rectification device and method for removing sulfide in MTBE

A heat pump rectification and sulfide technology, applied in fractionation, chemical industry, organic chemistry, etc., can solve the problems of unreasonable energy utilization, high energy consumption of desulfurization, failure to achieve energy saving, etc., to improve heat utilization efficiency, simple system, The effect of reducing consumption

Active Publication Date: 2016-03-02
CHINA CONSTR IND & ENERGY ENG GRP CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The above-mentioned methods all have deficiencies. The ordinary rectification method can realize deep desulfurization, but the conventional rectification tower takes heat from the top condenser and supplies heat to the reboiler of the tower kettle at the same time. Usually, the heat taken by the top condenser is The heat is about 90% of the heat added to the reboiler of the tower kettle, the energy utilization is very unreasonable, and the desulfurization energy consumption of ordinary rectification equipment is very large
Extractive distillation is generally used in difficult-to-separate systems. The addition of extractant is used to increase the relative volatility of target components. Since the boiling points of MTBE and sulfides differ greatly, ordinary distillation can achieve desulfurization. Distillation desulfurization can not achieve the purpose of energy saving

Method used

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  • Heat pump rectification device and method for removing sulfide in MTBE

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1, MTBE comes from a refinery catalytic reaction rectification unit, characterized by MTBE99.05%, methanol 0.0123%, tert-butanol 0.0324%, methyl sec-butyl ether 0.51%, water 0.00438%, trimethyl- 2-pentene 0.285%, diisobutene 0.0285%, 2-methyl-1-butene 0.0372%, isopentane 0.0399%, dimethyl disulfide 0.0247%, ethyl methyl disulfide 0.0149%, methyl 0.0051% tert-butyl sulfide, 0.00175% diethyl disulfide, 0.00325% dimethyl sulfide, and a total sulfur content of 497ppm. The packing of the rectification tower is wire mesh corrugated structured packing, the number of theoretical plates of the rectification tower is 20, the working pressure of the rectification tower is normal pressure, the feed position is 14 theoretical plates, the reflux ratio is 1.6, the bypass control valve is closed, and the gas at the top of the tower is compressed Afterwards, the pressure is 1.8 bar, and the outlet temperature of the compressor is 73.6°C. The raw material enters the rectificatio...

Embodiment 2

[0030] Example 2, the overall process is the same as Example 1, but the difference is: the total sulfur content is 4188ppm, the sulfur-containing species is dimethyl disulfide 0.1878%, ethyl methyl disulfide 0.1249%, methyl tert-butyl sulfide 0.0851%, diethyl disulfide 0.01125%, dimethyl sulfide 0.00975%. MTBE with a purity of 98.95% enters the device as the raw material. During the rectification and desulfurization process, the number of theoretical plates in the rectification column is 20, the working pressure of the rectification column is normal pressure, the feed position is 14 theoretical plates, the reflux ratio is 2, and the bypass control The valve is closed, the pressure of the tower top gas is 2 bar after being compressed, and the outlet temperature of the compressor is 77.4°C. The raw material enters the rectification column at 1250kg / hr. After the device is in stable operation, the heat load of the main heat exchanger at the bottom of the tower is 0.284Gcal / h, the...

Embodiment 3

[0031] Embodiment 3, the overall process of this embodiment is the same as that of 1. This embodiment simulates the special working condition of insufficient system energy, opens the bypass control valve, bypasses the auxiliary cooler, and the total sulfur content is 110ppm. Among them, dimethyl disulfide 0.0057%, ethyl methyl disulfide 0.0039%, methyl tert-butyl sulfide 0.0009%, diethyl disulfide 0.0005%, dimethyl sulfide 0.0004%, total sulfur The content is 497ppm. MTBE with a purity of 99.2% enters the device as a raw material. During the rectification and desulfurization process, the number of theoretical plates in the rectification tower is 20, the working pressure of the rectification tower is normal pressure, 14 theoretical plates in the feeding position, and the reflux ratio is 1. After the top gas is compressed, its pressure is 1.8 bar, and the outlet temperature of the compressor is 73.6°C. The raw material enters the rectification column at 1250kg / hr. After the dev...

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Abstract

The invention relates to a heat pump rectification device and method for removing sulfide in MTBE (Methyl Tertiary Butyl Ether). The device mainly comprises a feed preheater, a rectification tower, a compressor, an auxiliary reboiler, a main reboiler, an auxiliary cooler, a product cooler, a buffer tank and a reflux pump. The gas the distillation tower top is compressed by the compressor into superheated steam, which is used as a heat source and introduced through the reboiler for heat exchange at the tower bottom; and condensed liquid after heat exchange enters the buffer tank, passes through a reflux pump and is preheated with the raw materials by the feed preheater; and part of the cooled liquid is pumped back to the rectification tower for reflux, and the other part of the cooled liquid is recovered as a top product. By using the heat pump distillation, the transfer of the heat taken by the tower top condenser to the reboiler at the tower bottom is realized, which greatly reduces the energy consumption. Sulfur content of MTBE at the distillation tower top is 5-9ppm, and the recovery rate of MTBE is 99.6-99.8%. The device is simple for operation, safe, reliable, efficient and energy-saving.

Description

technical field [0001] The invention belongs to the technical field of petrochemical industry, in particular to a heat pump rectification device and method for removing sulfide in MTBE. Background technique [0002] Methyl tert-butyl ether (abbreviated as MTBE) is the addition reaction product of isobutylene and methanol in the C4 fraction of liquefied petroleum gas. MTBE is a blending component of high-quality gasoline, which is used to improve the octane number and antiknock performance of gasoline , It can also be used as a raw material for cracking to produce high-purity isobutene. [0003] Automobile fuel is the main source of air pollution in cities. The country has stricter and stricter quality requirements for automobile gasoline. The National V standard stipulates that the sulfur content in gasoline is less than 10ppm, and the amount of MTBE added as a gasoline blending component is generally 10-20%. Therefore, the sulfur content of MTBE must be reduced to below 10...

Claims

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Application Information

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IPC IPC(8): B01D3/14C07C41/42C07C43/04
CPCB01D3/14C07C41/42C07C43/046Y02P20/10
Inventor 秦凤祥李凭力黄益平徐义明李英栋陆晓咏岳昌海孙玉玉赵雅静
Owner CHINA CONSTR IND & ENERGY ENG GRP CO LTD
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