Separation method for coal-based fischer-tropsch olefin

A technology for coal-based fees and olefins, which is used in the purification/separation of hydrocarbons, adsorption purification/separation, chemical instruments and methods, etc. It can solve the problems of complex raw material composition, poor product diversity, and poor production continuity, and achieve a simple process flow. , Product diversity is strong, and the effect of ensuring continuity

Active Publication Date: 2019-04-16
INNER MONGOLIA YITAI COAL BASED NEW MATERIALS RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are deficiencies in the existing preparation and separation methods, which are as follows: (1) The traditional separation of coal-based alkanes and olefins adopts the method of molecular sieve adsorption, which is limited by the life of the molecular sieve and needs to be periodically shut down for molecular sieve regeneration. High cost, poor production continuity, low production efficiency, and low purity of olefins obtained
(2) The extraction agent selected by the existing extraction and rectification process is a low-boiling extraction agent, which can only separate substances below C8, and cannot meet the requirements for the separation of Fischer-Tropsch alkanes and olefins above C8
(3) The carbon number of olefins obtained by the ethylene oligomerization route can

Method used

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  • Separation method for coal-based fischer-tropsch olefin
  • Separation method for coal-based fischer-tropsch olefin
  • Separation method for coal-based fischer-tropsch olefin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] The carbon number of the target olefin is 8, the extraction agent is dimethyl phthalate, and the operating parameters of the light removal tower are: the temperature of the tower bottom is 58°C, the operating pressure is 21.3kpa, the number of trays is 65, the feed position is 45, and the reflux ratio It is 4:1; the operating parameters of the weight-removing tower are: tower kettle temperature 80°C, operating pressure 21.3kpa, number of trays 55, feed position 35, reflux ratio is 5:1; extractive distillation column operating parameters are: tower kettle The temperature is 85°C, the operating pressure is 21.3kpa, the number of trays is 40, the feed position is 18, and the reflux ratio is 5.5:1; the mass ratio of extraction agent to raw material is 5:1; The pressure is 21.3kpa, the number of trays is 45, the feed position is 23, and the reflux ratio is 4.5:1. The purity of the olefin product is above 99.7wt%, the content of oxygen-containing compounds is less than 10ppm, ...

Embodiment 2-11

[0053] The basic treatment method is the same as in Example 1, but the specific operating parameters are different, as shown in Table 4-Table 8.

Embodiment 12

[0055] The product that embodiment 2-11 extraction rectification obtains is passed into the adsorption tower that molecular sieve is housed, carries out deoxidation treatment, carries out further adsorption separation to oxygenate (adsorbent is 5A molecular sieve, and the mass ratio of adsorbent and oil is 1 : 1), operating temperature is 40 DEG C, pressure 0.5Mpa obtains product purity all higher than 99.7wt%, oxygen-containing compound content is lower than 1ppm.

[0056] Table 4 Example 2-3 target olefin carbon number and process parameters

[0057]

[0058] Table 5 Example 4-5 target olefin carbon number and process parameters

[0059]

[0060]

[0061] Table 6 Example 6-7 target olefin carbon number and process parameters

[0062]

[0063]

[0064] Table 7 Example 8-9 target olefin carbon number and process parameters

[0065]

[0066]

[0067] Table 8 Example 10-11 target olefin carbon number and process parameters

[0068]

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Abstract

The invention relates to a method for separating olefin from coal-based fischer-tropsch synthesis light distillate oil. The method comprises the following steps of (1) conducting deacidification treatment on fischer-tropsch light distillate oil raw materials; (2) absorbing the deacidification-treated distillate oil to remove a carbonyl compound; (3) ensuring that the distillate oil after deacidification enters a de-lighting tower, a component with a carbon number less than n is separated from the top of the de-lighting tower, a bottom component enters a de-weighting tower, a component with a carbon number greater than n is taken off from the bottom of the de-weighting tower, and a component with a carbon number of n is separated from the top of the de-weighting tower; (4) ensuring that thecomponent of the carbon number of the n enters an extractive distillation tower and is in reverse contact with an extracting agent, a non-polar alkane is separated from the top of the tower, and theextracting agent and the target olefin are distilled from the bottom into a recovery tower; (5) ensuring that the target olefin is distilled off from the top of the recovery tower, and the extractingagent is distilled off from a tower kettle and recycled to the extractive distillation tower. Due to the preparation of the high carbon number olefin, and negative pressure distillation is used for preventing olefin cracking, which ensures the structural integrity of the olefin.

Description

technical field [0001] The invention relates to a separation method suitable for Fischer-Tropsch olefins, in particular to a method for separating olefins from coal-based Fischer-Tropsch alkenes. Background technique [0002] High-carbon olefins are important and commonly used organic petrochemical raw materials. They can be used as detergents, oil additives, surfactants and pharmaceutical intermediates. They can also be used as high-quality comonomers to produce high-grade polyolefin resins. [0003] The existing olefin preparation technologies are divided into two categories: one is the coal-based route, and the other is the petroleum route (also known as ethylene oligomerization). The coal-based route refers to the separation of alkanes from coal-based light distillates to obtain olefins. The commonly used methods include molecular sieve adsorption process and extractive distillation process; the petroleum route refers to the preparation of olefins by ethylene oligomeriza...

Claims

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Application Information

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IPC IPC(8): C07C7/00C07C7/13C07C9/15
CPCC07C7/005C07C7/13C07C9/15
Inventor 李俊诚陈浩庭张晶泉钱震菅青娥张晓龙武靖为高源邬学霆
Owner INNER MONGOLIA YITAI COAL BASED NEW MATERIALS RES INST CO LTD
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