Method for controlling water content of propylene product in coal-based methanol propylene production process

A technology for methanol to propylene and product water, which is applied in the direction of hydrocarbon production from oxygen-containing organic compounds, organic chemistry, etc., can solve problems such as difficult regeneration, reduced water absorption capacity of molecular sieves, and influence on water absorption effect, etc., to achieve low cost of device transformation and high process efficiency. Improve the ease and solve the effect of excessive water content

Active Publication Date: 2012-02-08
CHNA ENERGY INVESTMENT CORP LTD +2
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  • Abstract
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AI Technical Summary

Problems solved by technology

In the depropanizer overhead gas phase C containing excess water 3 The following components enter the deethanizer, and excess water continues to remain at the bottom of the deethanizer C 3 The liquid phase enters the propylene tower, causing the water content in the propylene product to exceed the standard
(2) After the liquid hydrocarbon product from the bottom of the separation tank at the four-stage outlet of the hydrocarbon compressor enters the liquid hydrocarbon dryer, it contains C 6 For heavy hydrocarbons above the component, the water absorption capacity of molecular sieves decreases rapidly due to the presence of heavy hydrocarbons, and after adsorbing heavy hydrocarbons on the surface of molecular sieves, it is not easy to regenerate completely due to the limitation of regeneration temperature, which affects the water absorption effect

Method used

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  • Method for controlling water content of propylene product in coal-based methanol propylene production process
  • Method for controlling water content of propylene product in coal-based methanol propylene production process
  • Method for controlling water content of propylene product in coal-based methanol propylene production process

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Experimental program
Comparison scheme
Effect test

Embodiment 1-4

[0033] According to the oxide index at the outlet of the oxide extraction tower, adjust the feed water volume of the oxide extraction tower, and as shown in Table 1, control the liquid level of the extraction tower. The content of dimethyl ether in the liquid phase of the oxide extraction tower is 0.248wt%, and the content of methanol is 0.005wt%; the content of dimethyl ether in the gas phase is 0.312wt%, and the content of methanol is 0.009wt%. At this time, the control material feed rate is 63.80% of the column capacity. As shown in Table 1, adjust the interface gauge and liquid level gauge range of the oxide extraction tower, and adjust the liquid level control height to reduce the water content entrained at the top outlet of the tower. A Karl Fischer instrument (model DL-31, Mettler-Toledo, USA) is installed at the inlet of the oxide extraction tower and the outlet of the oxide extraction tower to measure the trace amount of water contained in the hydrocarbon products.

...

Embodiment 5-9

[0037] Modification of the oxide extraction tower, adding liquid collection devices, such as coalescers or / and dehydration tanks. See Table 2 for details of the process modification. Among them, the coalescer used is Beijing Zhaohua Xianquan Technology Development Co., Ltd., and the model is BZTC-JJX-150×1500. The manufacturer of the dehydration tank is Beijing Zhaohua Xianquan Technology Development Co., Ltd., 2400mm, capacity 34m 3 .

[0038] Table 2

[0039]

Embodiment 10

[0041] Add a dehydration tank after the outlet of the oxide extraction tower and in the front section of the dryer.

[0042] table 3

[0043]

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Abstract

The invention relates to a method for controlling the water content of a propylene product in a coal-based methanol propylene production process, which comprises the following measures: adjusting the water intake quantity of an oxide extraction tower, so that the liquid level of the extraction tower is controlled to range between -15% and 15%; additionally arranging liquid collecting devices at the top or middle of the oxide extraction tower and / or in the space between the oxide extraction tower and driers; enlarging the length-diameter ratio of a molecular sieve bed in each drier; and increasing the quantity of the driers, and connecting all the driers in a parallel connection and series connection combined mode. The method makes only a small change on the original process flow, and is easy to implement; and the water content of the resulting propylene product can satisfy the standard of polymer grade propylene.

Description

technical field [0001] The invention relates to a process for producing propylene from coal-based methanol, more specifically, a method for controlling the water content of a propylene product in the process for producing propylene from coal-based methanol, so that the obtained propylene product can reach the standard of polymer-grade propylene. Background technique [0002] Propylene, one of the low-carbon olefins, is an important basic organic chemical raw material in the chemical industry. For a long time, the source of propylene at home and abroad has mainly relied on naphtha cracking technology. In the past ten years, with the gradual reduction of petroleum resources and the continuous rise of international crude oil prices, the production cost of propylene has continued to rise, which has greatly restricted the development of the propylene industry. Therefore, some researchers at home and abroad are trying to find new methods to produce propylene from non-petroleum res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/06C07C1/20
Inventor 张玉柱王勇张来勇焦洪桥张勇张伟袁玉龙王军马文瑞黄文陈四仿曹新波张晨露张堃
Owner CHNA ENERGY INVESTMENT CORP LTD
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