Purification method for deep dehydration and impurity removal of olefin by full-temperature range adsorptive extraction

A deep dehydration, full temperature range technology, used in hydrocarbon oil dehydration/demulsification, extraction purification/separation, adsorption purification/separation, etc., can solve the prominent contradiction between adsorption and desorption, short service life of adsorbent, and troublesome regeneration gas treatment and other problems, to achieve the effect of reducing the co-adsorption phenomenon, preventing the self-polymerization of olefins, and expanding the room.

Inactive Publication Date: 2018-03-09
SICHUAN TECHAIRS
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  • Claims
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Problems solved by technology

[0007] The present invention provides a purification method for deep dehydration and impurity removal of olefins through adsorption and extraction in the full temperature range. ") The extraction and separation process is coupled together. The adsorption mechanism and the desorption mechanism in the adsorption and desorption regeneration cycle are not the same. CCO2), carbon three and above components (C3+), methanol, ethanol, and water are used as extractants, and the extractant has a strong selective solubility for the adsorbate and the adsorbate has a large diffusion in the extractant fluid. The ability makes the desorption and regeneration completely complete, without considering the difficult situation of desorption caused by the deep adsorption of the adsorbate in the adsorption process, breaking through the traditional pressure swing adsorption (PSA), temperature swing adsorption (TSA), temperature swing adsorption (TPSA) and the whole The temperature range pressure swing adsorption (FTrPSA) process is limited to matching and solving the balance and contradiction between adsorption and desorption by changing pressure, temperature or pressure and temperature, making adsorption easy and desorption easy, thus solving the problem of existing olefins In dehydration and impurity removal methods, such as prominent contradictions between adsorption and desorption, short service life of adsorbent, incomplete regeneration, co-adsorption of water, oxygen-containing compounds and azeotropes, high-temperature heat carrier regeneration is required, troublesome subsequent treatment of regeneration gas, and high operating costs , Olefin yield and purity indicators are easily affected by the selection of purification process and other defects

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  • Purification method for deep dehydration and impurity removal of olefin by full-temperature range adsorptive extraction
  • Purification method for deep dehydration and impurity removal of olefin by full-temperature range adsorptive extraction
  • Purification method for deep dehydration and impurity removal of olefin by full-temperature range adsorptive extraction

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Embodiment 1

[0037] Such as figure 1 and figure 2 As shown, a purification method for deep dehydration and impurity removal of full-temperature adsorption extraction of olefins includes the following steps:

[0038] (1) Gas phase adsorption process, crude olefin raw material gas after the pretreatment unit removes alkyne, oxygen (O2), carbon monoxide (CO), arsenic / mercury and acid gas, the temperature is 60~80℃, 1.0~2.0MPa, It enters an adsorption tower and is adsorbed at an adsorption temperature of 60~80°C and an adsorption pressure of 1.0~2.0MPa. Water and trace impurities are used as adsorbates, which are adsorbed by the adsorbent loaded in the adsorption tower. After the adsorption is saturated, it enters the lower One-step process, extraction and desorption process; olefins are not adsorbed and flow out from the top of the adsorption tower to obtain olefin products with an olefin content greater than 99.9~99.99% (v / v); After extraction and desorption, it enters the gas phase adsor...

Embodiment 2

[0046] On the basis of the purification method of full-temperature adsorption, extraction, deep dehydration and impurity removal of olefins described in Example 1, further optimization, the raw material gas of crude olefins comes from the coal gasification synthesis of methanol to olefins (MTO / MTP) process, wherein , The content of trace impurities such as oxygen-containing compounds such as methanol and dimethyl ether and water is relatively high, which is 0.1~1.0% (v / v), and the temperature and pressure of the raw material gas remain unchanged. Due to the increase of water and impurity content in the feed gas, at first, it is necessary to increase the loading capacity of the adsorbent, and the loading capacity of the 13X type composite molecular sieve in this embodiment is about 20% more than that in Example 1; secondly, the extraction agent CCO The circulation The consumption needs to increase; the 3rd, the depressurization in the extractant regeneration process is lowered t...

Embodiment 3

[0048] On the basis of the purification method of a kind of olefin full-temperature adsorption extraction deep dehydration and impurity removal described in Example 1, it is further optimized, the composition of the raw material gas remains unchanged, and the scale of raw material feeding reaches more than 10 standard cubic meters per hour. The temperature is 100~120°C, the pressure is 2.0~3.0MPa, and it directly enters the gas phase adsorption process. The gas phase adsorption is carried out in a system consisting of an operating temperature of 100~120°C, an adsorption pressure of 2.0~3.0MPa, 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 material gas have been increased and i...

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Abstract

The invention discloses a purification method for deep dehydration and impurity removal of olefin by full-temperature range adsorptive extraction. The purification method is characterized in that crude olefin feed gas (liquid) enters a gas / liquid phase adsorption process, an extraction and desorption process and an extracting agent regeneration process sequentially, moisture and trace impurity components are absorbed by an absorbing agent, and an olefin product with a purity of more than or equal to 99.9-99.99 percent (v / v) flows out from the top of an adsorption 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 anddesorption gas enters the extracting agent regeneration process, and the extracting agent is recovered and recycled after treatment. The purification method disclosed by the invention has the benefits that by adopting an adsorption-extraction and desorption process and in combination with an adsorption mechanism and an extraction and desorption dissolving mechanism, the whole operation process ismore stable and safer, the energy consumption is low, the product purity is high, the equipment investment cost is low, the purity of the olefin product is more than or equal to 99.9-99.99 percent, and the yield is more than or equal to 99 percent.

Description

technical field [0001] The technical field of purification and refining of olefins of the present invention, more specifically relates to a method for purification of olefins through adsorption, extraction, dehydration, dehydration and impurity removal throughout the temperature range. Background technique [0002] Olefin monomers required for polyolefin production, especially ethylene propylene, which has a wide range of uses, have more and more production methods, such as petroleum cracking, hydrocarbon steam thermal cracking, hydrocarbon dehydrogenation, methanol to olefins, ethanol condensation and dehydration Olefins, and petrochemical dry gas recovery of olefins, etc. However, different production methods have different impurity components contained in olefin products. When used to polymerize high-purity polyolefin products, various trace or trace impurities must be removed. Therefore, the selected The methods of purifying are also different. [0003] There are two w...

Claims

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Application Information

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IPC IPC(8): B01D53/02C10G25/00C10G25/12B01J20/34C10G33/00C07C7/00C07C7/12C07C7/10C07C11/04C07C11/06
CPCB01D53/02B01J20/34B01J20/3458C07C7/005C07C7/10C07C7/12C10G25/00C10G25/12C10G33/00C10G2300/1088C10G2300/202C07C11/04C07C11/06Y02C20/40Y02P20/151Y02P20/50Y02P20/54Y02P30/40
Inventor 陈运刘开莉蔡跃明钟雨明
Owner SICHUAN TECHAIRS
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