Method for separating C6 mixed hydrocarbon by two-stage PSA

A technology of mixed hydrocarbons and separation process, which is applied in separation methods, dispersed particle separation, chemical instruments and methods, etc., which can solve the problems of high, complex and expensive equipment investment, and achieve the effects of low energy consumption, low investment and short construction period

Active Publication Date: 2020-05-05
FUYU ZHANGJIAGANG NEW MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the separation factor of the separated C8 aromatics molecules on the K, Ba-Y zeolite polar separation zeolite molecular sieve adsorbent is generally relatively low, no more than 5, so the annual processing capacity is as high as tens to millions of tons of m

Method used

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  • Method for separating C6 mixed hydrocarbon by two-stage PSA
  • Method for separating C6 mixed hydrocarbon by two-stage PSA
  • Method for separating C6 mixed hydrocarbon by two-stage PSA

Examples

Experimental program
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Effect test

Embodiment 1

[0073] Aromatics raffinate C6 mixed hydrocarbons, its composition is 77.9% methylcyclopentane and 22.1% n-hexane, high-purity methylcyclopentane and n-hexane were extracted respectively by two-stage pressure swing adsorption (PSA).

[0074] It can be seen from the data in Table 1 that the molecular weight of methylcyclopentane is 84.16, which is lower than that of n-hexane, which is 86.18. The boiling points of n-hexane and methylcyclopentane are 69°C and 71.8°C respectively, with a difference of 1.8°C, and it is difficult to separate them by distillation.

[0075] Wherein, the A-type modified large-pore faujasite polar separation adsorbent is used in the first stage of PSA separation, and the 5A (CaA) molecular sieve type selective separation adsorbent is used in the second stage of PSA adsorption separation, including the following steps:

[0076] (1) Selection, preparation and phase identification of type A modified large-pore faujasite polar separation adsorbent

[0077] ...

Embodiment 2

[0092] The C6 mixed hydrocarbons of coal liquefied light oil are obtained by low-temperature distillation of coal liquefied light oil. The composition of C6 mixed hydrocarbons is 13.8% methylcyclopentane and 86.2% cyclohexane, and is obtained by two-stage pressure swing adsorption (PSA) Separately extract high-purity methylcyclopentane and cyclohexane. Among them, the first-stage PSA separation uses B-type modified large-pore faujasite polar separation adsorbent, and the second-stage PSA adsorption separation uses the MFI type (ZSM-5) hydrophobic silicalite type-selective separation adsorbent, including the following step:

[0093] (1) Selection, preparation and phase identification of B-type modified macroporous faujasite polar separation adsorbent

[0094]The faujasite-type hierarchical separation adsorbent adsorbs methylcyclopentane with a polarizability of 13.1 preferentially and separates it from cyclohexane molecules with a polarizability of 10.7. The basis for the typ...

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Abstract

The invention relates to a method for separating C6 mixed hydrocarbon by two-stage PSA (Pressure Swing Adsorption). Methyl cyclopentane, n-hexane and cyclohexane with the purity higher than 99.0% arerespectively extracted from C6 mixed hydrocarbon with different sources. The method comprises a two-stage PSA separation process, wherein the first-stage PSA separation process comprises the followingsteps: mixing a polar separation adsorbent with C6 hydrocarbon mixture steam, adsorbing and separating a component A under a first pressure condition to obtain a high-purity component B, and desorbing and liquefying the component A adsorbed by the adsorbent under a second pressure condition to obtain a first-stage desorbed substance A-rich mixed hydrocarbon. In the second-stage PSA separation process, a selective separation adsorbent is mixed with A-rich mixed hydrocarbon steam of a first-stage desorbed substance, a component B is adsorbed and separated under a first pressure condition to obtain a high-purity component A, and the component B adsorbed by the adsorbent is desorbed and liquefied under a second pressure condition to obtain a second-stage desorbed substance. And the second-stage desorbed substance is mixed with the original C6 hydrocarbon mixture, and the two-stage PSA separation and adsorption separation process is repeated.

Description

technical field [0001] The invention relates to the technical field of two-stage pressure swing adsorption (PSA) separation, in particular to a method for separating C6 mixed hydrocarbons by PSA. Background technique [0002] Industrially, methylcyclopentane is used as an organic solvent to dissolve resins, waxes, asphalt, rubber and drying oils. It has recently been found that methylcyclopentane is a good refrigerant and can replace Freon as a refrigerant in fluorine-free and environmentally friendly refrigeration equipment. n-Hexane is mainly used as a solvent to prepare viscose to bond shoe leather or bags. It is often used in wiping and cleaning operations in the production process of the electronic information industry, as well as crude oil leaching in the food manufacturing industry, propylene solvent recovery in the plastics manufacturing industry, and chemical industry. extractant, solvent extraction of floral fragrance produced by daily chemicals, etc. Cyclohexane...

Claims

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Application Information

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IPC IPC(8): C07C7/13C07C9/15C07C13/18C07C13/10B01D53/047
CPCC07C7/13B01D53/047C07C2601/08C07C2601/14C07C9/15C07C13/18C07C13/10
Inventor 濮鹏翔曹宇凡龙英才
Owner FUYU ZHANGJIAGANG NEW MATERIALS TECH CO LTD
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