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A purification method for deep dehydration and impurity removal of ethylene glycol adsorption extraction

A deep dehydration and ethylene glycol technology, applied in chemical instruments and methods, separation methods, solvent extraction, etc., can solve the problems of large separation coefficient, small flux, and other impurities, so as to solve desorption difficulties and large adsorption capacity. , the effect of reducing viscosity

Active Publication Date: 2020-09-01
SICHUAN TECHAIRS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the main defect of the steam permeation membrane separation method is similar to that of the pervaporation method. The quality of alcohol products also has certain difficulties in industrialization; thirdly, molecular sieve membrane is a new separation method that combines the characteristics of molecular sieve dehydration and pervaporation membrane water permeability. It has the advantages of large separation coefficient and relatively large flux, and is also more suitable Concentration in aqueous ethylene glycol

Method used

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  • A purification method for deep dehydration and impurity removal of ethylene glycol adsorption extraction
  • A purification method for deep dehydration and impurity removal of ethylene glycol adsorption extraction

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Embodiment 1

[0035] Such as figure 1 and figure 2 As shown, a purification method for deep dehydration and impurity removal of ethylene glycol adsorption extraction includes the following steps:

[0036] (1) Liquid-phase adsorption process, ethylene glycol aqueous solution containing 0.1-1.0% water (mass ratio, the same below), containing 0.1% trace impurities, such as acetaldehyde, formic acid, etc., as raw materials, the temperature is 30-40 ℃, the pressure is normal pressure, directly enters an adsorption tower in the liquid phase adsorption process composed of two adsorption towers from the top of the tower, and performs liquid phase adsorption at the adsorption temperature 30~40 ℃ and the adsorption pressure is normal pressure, water And trace impurities are used as the adsorbate, which is adsorbed by the adsorbent packed in the adsorption tower. After the adsorption is saturated, it enters the next step, the extraction and desorption process; the ethylene glycol is not adsorbed and...

Embodiment 2

[0044] Further optimized on the basis of a purification method for deep dehydration and impurity removal of ethylene glycol adsorption and extraction described in Example 1, the water content of the ethylene glycol aqueous solution is 15-20%, and the trace impurity content is still 0.1%. The temperature, pressure, etc. remain unchanged. Due to the increase of the water content in the raw material, at first, it is necessary to increase the loading amount of the adsorbent, and the loading amount of the A-type molecular sieve in the present embodiment is about 20% more than that in Example 1; secondly, the recycling amount of the extractant CCO needs to be increased; The 3rd, reduce the pressure in the extraction agent regeneration process to a lower level, down to the 1.0 ~ 3.0MPa range, so that more water and trace impurity components are fully separated from the CCO Extractant, or still maintain embodiment 1 The pressure range in the middle is 3.0~4.0MPa, and the temperature i...

Embodiment 3

[0046] On the basis of a purification method for deep dehydration and impurity removal of ethylene glycol adsorption and extraction described in Example 1, it is further optimized, the composition of the raw material gas remains unchanged, and the feed scale of the raw material ethylene glycol aqueous solution reaches 100,000 tons / year Above, the temperature is 70~90°C, the pressure is normal pressure, directly enter the liquid phase adsorption process, and the liquid phase adsorption is carried out in a system composed of 70~90°C operating temperature, adsorption pressure is normal pressure, and 4 adsorption towers. The 4 adsorption towers are connected in parallel 2-2 respectively, 2 adsorption towers absorb, and the other 2 adsorption towers extract and desorb, and the 2 groups of adsorption towers operate alternately to ensure the continuous entry of raw materials. In this embodiment, the temperature and processing capacity of the raw materials are increased and increased. ...

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Abstract

The invention discloses a purification method for deep dehydration and impurity removal of ethylene glycol by adsorptive extraction. The purification method comprises a liquid phase adsorption process, an extraction and desorption process and an extracting agent regeneration process; when a thermo-ethylene glycol aqueous solution enters the liquid phase adsorption process, moisture and trace impurity components are adsorbed by an adsorbent, and an ethylene glycol product with the purity being more than or equal to 99.9-99.99% flows out from the bottom of a tower; after the adsorption process is completed, an extracting agent is introduced into the adsorption tower for the extraction and desorption process to dissolve out the moisture and the trace impurity components. Extraction and desorption gas enters the extracting agent regeneration process and is depressurized or condensed and cooled, and the extracting agent escapes from the top of a separation kettle and is returned to the extraction and desorption process for recycling after treatment or pressurization. The moisture and the trace impurity components are discharged out from the bottom of the separation kettle. The purification method disclosed by the invention has the benefits that with the adoption of an adsorption-extraction and desorption process, the energy consumption is low, the product purity is high, the treatment amount is large, the equipment investment cost is low, the purity of the ethylene glycol product is more than or equal to 99.9-99.99% (mass ratio), and the yield is more than or equal to 98-99%.

Description

technical field [0001] The invention belongs to the technical field of chemical separation—drying, dehydration and purification, and more specifically relates to a purification method for ethylene glycol adsorption, extraction, deep dehydration and impurity removal. Background technique [0002] Ethylene glycol is the main chemical raw material for the manufacture of polyester fibers and antifreeze agents, and can also be used to produce some special chemical products, such as alkyd resins, fluids for hydraulic systems, plasticizers, glyoxal, etc. The production method of ethylene glycol is currently mainly composed of the petroleum route of pressurized hydration of ethylene oxide (EO) and the coal chemical route of separation of syngas and hydrogenation of oxalate. Among them, the device for producing ethylene glycol by pressurized hydration of ethylene oxide is relatively common. It combines ethylene oxide with water. Under the condition of mass ratio of 20~25:1, the conte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C29/74C07C29/76C07C31/20B01D15/00B01D11/02
CPCB01D11/0203B01D11/0292B01D15/00C07C29/74C07C29/76C07C31/202Y02P20/54
Inventor 蔡跃明钟雨明陈运
Owner SICHUAN TECHAIRS
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