A method for reducing the influence of residual liquid in the bed pipeline between the adsorption tower and the rotary valve of the adsorption separation device
A technology for adsorption separation and residual liquid, applied in separation methods, solid adsorbent liquid separation, chemical instruments and methods, etc., can solve the problems of high energy consumption and incomplete replacement, achieve low cost, reduce the impact of residual liquid, Simple operation effect
Active Publication Date: 2018-06-15
CHINA PETROLEUM & CHEM CORP +1
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[0010] In order to overcome the shortcomings of incomplete replacement and high energy consumption in the existing simulated moving bed technology where only nearly pure desorbent is used for the replacement surface of the pipeline that has transported the raw material, the present invention provides an adsorption separation device that reduces the adsorption tower and the rotary valve. Method for Residual Liquid Effect in Interbed Pipeline
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[0030] A method for reducing the influence of residual liquid in the bed pipeline between the adsorption tower and the rotary valve of the adsorption separation device. The rotary valve and each bed of the adsorption tower are connected by a bed pipeline. During the stable period when the rotary valve is not switched, there is Four main pipelines transport desorbent, extract, feedstock and raffinate respectively, and there are three auxiliary pipelines for displacement. Use the existing three auxiliary pipelines to replace the bed pipelines that will be used to transport the desorbent, raw materials and raffinate, and use the one-in two-out switching valve to replace the initial section that will be used to transport the extract after the rotary valve steps. bed line. The bed pipeline between the desorbent and the extract bed pipeline is used as the adsorbent replacement pipeline; the bed pipeline between the raw material and the raffinate bed pipeline is used as the raw mater...
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The invention discloses a method for reducing the influence of bed pipeline residual liquid between an adsorption tower and a rotary valve of an adsorption separation device. Each bed of the rotary valve and the adsorption tower are connected through a bed pipeline. During a rotary valve non-switch stable period, four main pipelines among the bed pipelines are respectively used for delivering a desorbent, extract liquid, raw materials and a raffinate; and three auxiliary pipelines are used for replacement. According to the invention, the existing three auxiliary pipelines are used for replacing the bed pipelines which will be used for delivering the desorbent, the raw materials and the raffinate; a switching valve with one inlet and two outlets is used for replacing the bed pipeline used for delivering the extract liquid at an initial section after rotary valve stepping is finished. According to the invention, on a basis that four material pipelines are maintained, the one replacement in and one replacement out process, second replacement process and adopted pipelines of existing processes are used for replacing material pipelines and residual materials, such that the influence of residual liquid is greatly reduced. Also, operation is simple, and cost is low.
Description
technical field [0001] The invention relates to a method for reducing the influence of residual liquid in a bed pipeline between an adsorption tower of an adsorption separation device and a rotary valve, and belongs to the field of adsorption and separation of substances. Background technique [0002] P-xylene is one of the important raw materials in the chemical and fiber industries. There are three methods to obtain p-xylene from C8 aromatic hydrocarbon isomers: adsorption separation, crystallization and fractionation, among which the adsorption separation method is more widely used . [0003] Adsorption separation is very effective for the separation of isomers with very small boiling point difference or the separation of different components with different structural characteristics, and can be used for the separation of p-xylene and other C8 aromatic hydrocarbon isomers , Separation of normal alkanes and other structural hydrocarbons, etc. [0004] Adsorption separati...
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IPC IPC(8): B01D15/18
Inventor 钱学勤
Owner CHINA PETROLEUM & CHEM CORP