A kind of method and device for deep removal of methanol from carbon four

Abstract

The invention relates to a method and device for deep demethanolization of C4. The demethanolization treatment of C4 extracted from the top of the azeotropic distillation tower is divided into three steps: firstly, the pre-distribution extraction of C4 is carried out by using microphase distribution technology; The C4 and the extract after the final extraction fully enter the modular deep separation device for deep separation of C4 and the extract; the C4 after demethanolization enters the subsequent production device, and the extract returns to the methanol recovery tower for further extraction. Recycle. The present invention also provides a set of devices for realizing the method, including an extraction device and a separation device; the extraction device is divided into a microphase disperser and a micro-swirl flow extraction device; the separation device is a coalescence separation module and a corrugated plate enhanced sedimentation, water bag, Boundary meter and several other parts. The method of the invention has high processing speed and high efficiency, and the methanol content in the treated C4 is not more than 5 ppm, thereby improving the performance of the C4 follow-up deep processing device.

Description

technical field [0001] The invention relates to a method for deep demethanolization of C4, specifically, pre-distributed extraction is carried out by using micro-phase distribution technology, and then deep extraction and deep separation of methanol in C4 are carried out by using micro-swirl extraction technology and coalescence separation technology , Efficient and rapid removal of methanol in C4, improving the performance of subsequent C4 deep processing devices. Background technique [0002] A considerable amount of low-molecular hydrocarbon molecules, such as carbon four, will be generated in the process of petroleum processing; on the one hand, they can be directly burned as fuel, but the economic benefit of using them as fuel is not high, and there is no price compared with natural gas and other fuels Advantages; on the other hand, since a considerable amount of olefins are good raw materials for organic synthesis, it is very economical to use these olefins to prepare ...

AI Technical Summary

Problems solved by technology

[0004] Most of the existing C4 demethanolization adopts methanol extraction tower (or called water washing tower) to separate the methanol in C4, but most of the methanol extraction towers have poor treatment effect. The methanol content will still reach 1000-3000ppm, which cannot meet the requirements of the alkylation unit. During the operation of the methanol extraction tower, there are still problems such as tray support beam corrosion and extraction tower blockage. Today's methanol extraction tower is not suitable for C4 For the treatment of methanol removal, it is urgent to improve it or a new technology to replace the methanol extraction tower

[0005] Chinese patent CN 203108398 U discloses a method for reducing the amount of desalinated water. This method solves the excess desalinated water in the reaction. Through the adjustment of the process flow, the amount of useless desalinated water in the reaction equipment is reduced to maximize the degree of desalinated water. However, this method does not fundamentally solve the problem of large water consumption for desalinated water. The reason why the washing volume of the methanol water washing tower is relatively large is that the methanol in the desalted water and carbon four has not been fully contacted, and cannot achieve full The purpose of extraction leads to the necessity of excessive desalted water in the water washing tower to participate in the extraction, so as to extract as much methanol in C4 as possible

[0006] Chinese patent CN 102093176 B discloses a method for extracting methanol from methylal. The method utilizes continuous countercurrent rotary disk action to conduct multiple countercurrent extraction processes between methylal containing methanol and the extract, so that as much methanol as possible can be transferred to However, this method can only complete the extraction of methanol droplets with a particle size of more than 10um, and the process of extraction and transfer cannot be achieved for methanol droplets with a particle size of less than 10um, so that a large amount of methanol is still entrained in the original solution , this method will have the disadvantages of cumbersome process, high energy consumption and incomplete extraction in the application of C4 demethanol

[0007] Chinese application number 201410472173.3 discloses a method of extracting and then rectifying to realize the separation of carbon tetrachloride and methanol, because carbon tetrachloride and carbon four are miscible, this method can be applied to carbon four demethanol, but This method has a problem of high energy consumption and incomplete extraction, which leads to incomplete separation and cannot achieve sufficient separation.

[0008] In recent years, there have been many research reports on the use of molecular sieves to adsorb methanol in C4. For example, China Application No. 200810145291.8 discloses a method of using molecular sieves to adsorb methanol, using adsorbents to adsorb methanol in C4 in molecular sieves, thereby realizing C4. Separation from methanol, but this technology needs to consume a large amount of adsorbent and can only be applied under some specific conditions, so a wide range of industrial applications does not

[0009] Chinese application number 201410440054.X announced a method for improving the methanol extraction tower, which made beneficial improvements in structure and process flow, but did not fundamentally solve the problem of low efficiency, large water consumption, and existing problems in the methanol extraction tower. clogging and corrosion

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