Adsorption extraction separation and purification method

An extraction and extraction agent technology, applied in the field of chemical separation, purification and purification, can solve the problems of low yield of oxygenated compounds, low regeneration efficiency, low adsorption efficiency, etc., and achieve the effect of solving the extremely difficult choice of desorption process

Inactive Publication Date: 2018-03-09
SICHUAN TECHAIRS
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  • Claims
  • Application Information

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Problems solved by technology

However, for trace amounts of oxygenated compounds, due to their low concentration as an adsorbate, the adsorption efficiency is also low, and the regeneration efficiency is lower, so the yield of oxygenated compounds is very low.

Method used

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  • Adsorption extraction separation and purification method
  • Adsorption extraction separation and purification method
  • Adsorption extraction separation and purification method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Such as figure 1 As shown, a method of adsorption, extraction, separation and purification is applied to the preparation of ultra-pure ammonia (99.99999% pure) by deep dehydration, impurity removal and purification using liquid ammonia as a raw material, including the following steps:

[0055] (1) Liquid phase adsorption process, liquid ammonia with a purity of 99.999% (v / v, 5N grade, the same below) is used as the raw material liquid, at a temperature of -10~10°C, 1.0~2.0MPa, enters a The adsorption tower performs liquid phase adsorption at an adsorption temperature of -10~10°C and an adsorption pressure of 1.0~2.0MPa. A small amount of water is used as an adsorbate, which is adsorbed by a type A or 13X molecular sieve adsorbent packed in the adsorption tower. After the adsorption is saturated, enter the next step, the extraction and desorption process; the ammonia and a small amount of low-boiling impurity components are not adsorbed, but flow out from the bottom of t...

Embodiment 2

[0061] Such as figure 2 As shown, a method of adsorption, extraction, separation and purification is applied to the simultaneous recovery of H2 and C2+ in refinery dry gas, in which C2+ (carbon 2 and above components) is the adsorbate, and H2 (hydrogen) is the non-adsorbing phase group Divide, present embodiment is made of following operation:

[0062] (1) C2+ adsorption concentration process, temperature is 50~60℃, pressure is 3.0~4.0MPa, H2 content is 35% (V / V, the same below), C2+ content is 16%, methane is 38%, other inert components The 11% refinery dry gas directly enters the C2+ adsorption and concentration system through the intake pipe without cooling or pressurization, and adopts a 2-tower parallel process at an operating temperature of 50~60°C and an operating pressure of 3.0~4.0MPa. Adsorption, one adsorption tower performs medium-temperature and medium-pressure adsorption, the other adsorption tower performs isothermal and isobaric C2+ extraction and desorption,...

Embodiment 3

[0068] Such as image 3 As shown, a method of adsorption, extraction, separation and purification is applied to the recovery of olefins from polyolefin tail gas, in which, C2+ (carbon two and above components) olefins are the adsorbate, and N2 (nitrogen) is the non-adsorption phase component. This implementation For example, it consists of the following steps:

[0069] (1) Olefins enrichment process, the composition of polyolefin mixed tail gas as feed gas is as follows, among which, C2+ olefins components include ethylene content of 25.5% (volume ratio, the same below), propylene content of 17.5%, and N2 content of 48.2 %, H2 content 8.7%, and a small amount of carbon four / carbon five (C4+) components, the feed gas temperature is 20~40°C, the pressure is 3.0~4.0MPa, and it directly enters one of the adsorption towers composed of two parallel The adsorption tower carries out the adsorption and concentration of olefins, and the adsorption temperature and adsorption pressure ar...

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Abstract

The invention discloses an adsorption extraction separation and purification method. According to the adsorption extraction separation and purification method, by virtue of difference in temperaturesand pressures of different raw material streams as well as selective adsorption capacities and selective dissolution capacities between an adsorbate component and a non-adsorbed phase component on anadsorbent and an extractant, adsorption concentration, extraction desorption, extractant regeneration, refining purification and other processes are performed; the extractant is used for dissolving out the adsorbate adsorbed by the adsorbent in the adsorption concentration process and the adsorbate remaining in a dead space inside an adsorption tower, and is recycled in the extractant regenerationprocess; a non-adsorbed phase fluid escaping out in the adsorption concentration process can be recycled through the refining purification process. By the adsorption extraction separation and purification method, simultaneous high-purity and high-yield separation, purification and recycling of the target adsorbate component and the target non-adsorbate component are achieved; cycle operation of isothermal and isobaric, isothermal and pressure-swing, temperature-swing and isobaric, and temperature-swing and pressure-swing adsorption and extraction desorption can be achieved, and a brand-new technical method is provided for adsorption separation and purification.

Description

technical field [0001] The invention belongs to the field of separation, purification and purification of chemical industry, and more specifically relates to a method for separation and purification of adsorption extraction gas. Background technique [0002] Chemical separation is to separate a mixture fluid (gas or liquid) containing various components to obtain one or some single components as products, or to remove one or some single components for purification, such as ethylene and refining Hydrogen (H2) and carbon 2 and above components (C2+) such as ethylene and ethane are recovered from the tail gas of the plant, and high-purity ethylene glycol products are obtained by dehydration and removal of ethylene glycol aqueous solution, and electronic grade products are obtained by dehydration and removal of industrial-grade liquid ammonia. Ultra-pure ammonia, polyolefin tail gas recovery of olefins, natural plant extraction of essential oils and their products, separation an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/04B01D53/047B01D15/08
CPCB01D15/08B01D53/0462B01D53/047B01D2259/40007
Inventor 钟雨明蔡跃明刘开莉陈运
Owner SICHUAN TECHAIRS
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