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A kind of method of dimethyl ether molecular sieve dehydration

A technology of molecular sieve and dimethyl ether, applied in the field of dimethyl ether dehydration, can solve problems such as adverse effects of factories, and achieve the effects of reducing energy consumption, high yield and small material loss

Active Publication Date: 2017-12-19
SINOPEC GUANGZHOU ENG CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] For the dehydration of light hydrocarbon components by liquid-phase molecular sieve, inert gas such as nitrogen is often used as the regeneration medium. The consumption of nitrogen accounts for more than 70% of the energy consumption of the liquid-phase molecular sieve dehydration unit. A large amount of regeneration gas discharged into the hydrocarbon venting system of the factory will also cause damage to the factory. Negative Effects

Method used

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  • A kind of method of dimethyl ether molecular sieve dehydration

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The raw material composition of dimethyl ether is shown in Table 1. The processing capacity is 10000kg / h, the operating elasticity is 60-110%, and the density is 661kg / m 3 , Operating temperature: 40°C, operating pressure: 1.2MPa(G).

[0038] The composition of table 1 dimethyl ether raw material

[0039] project

content

Dimethyl ether, %

≥99.9

Water / μg.g

300

[0040] The molecular sieve dehydration tower is filled with 3A molecular sieves, the effective adsorption capacity is 5% by mass, the filling height-to-diameter ratio of the molecular sieve dehydration tower is 4:1, and the calculation is based on the 7-day switching of a single tower, the inner diameter of the molecular sieve dehydration tower is 1.7m, and the filling height of the molecular sieve dehydration tower It is 6.8m.

[0041] Three molecular sieve dehydration towers are used for adsorption-regeneration, two in series in normal operation, and one for standby. Se...

Embodiment 2

[0050] The raw material composition of dimethyl ether is shown in Table 1. The processing capacity is 10000kg / h, the operating elasticity is 60-110%, and the density is 661kg / m 3 , Operating temperature: 40°C, operating pressure: 1.2MPa(G).

[0051] The composition of table 1 dimethyl ether raw material

[0052] name

content

Dimethyl ether, %

≥99.9

Water / μg.g -1

250

[0053] The molecular sieve dehydration tower is filled with 3A molecular sieves, the effective adsorption capacity is 5% by mass, the filling height-to-diameter ratio of the molecular sieve dehydration tower is 4:1, and the calculation is based on the 7-day switching of a single tower, the inner diameter of the molecular sieve dehydration tower is 1.5m, and the filling height of the molecular sieve dehydration tower It is 6.0m.

[0054] Three molecular sieve dehydration towers are used for adsorption-regeneration, two in series in normal operation, and one for standby. ...

Embodiment 3

[0063] The raw material composition of dimethyl ether is shown in Table 1. The processing capacity is 10000kg / h, the operating elasticity is 60-110%, and the density is 661kg / m 3 , Operating temperature: 40°C, operating pressure: 1.2MPa(G).

[0064] The composition of table 1 dimethyl ether raw material

[0065] name

content

Dimethyl ether, %

≥99.9

Water / μg.g -1

150

[0066]The molecular sieve dehydration tower is filled with 3A molecular sieves, the effective adsorption capacity is 5% by mass, the filling height-to-diameter ratio of the molecular sieve dehydration tower is 4:1, and the calculation is based on the 7-day switching of a single tower, the inner diameter of the molecular sieve dehydration tower is 1.4m, and the filling height of the molecular sieve dehydration tower It is 5.6m.

[0067] Three molecular sieve dehydration towers are used for adsorption-regeneration, two in series in normal operation, and one for standby. S...

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Abstract

The invention discloses a molecular sieve dehydration method for dimethyl ether. The dehydration method comprises the following steps: adsorption; pressure relief and recovery; and regeneration. Molecular sieve dehydration columns (1), (2) and (3) are arranged; two molecular sieve dehydration columns are connected in series for adsorption and dehydration, and the rest molecular sieve dehydration column is used for pressure relief and recovery and regeneration; the molecular sieve dehydration columns are filled with 3A molecular sieves and 4A molecular sieves in grades; and when water content of a material flow at an outlet of a primary tandem molecular sieve dehydration column contacting with a raw material is greater than 5 [mu]g / g, the molecular sieve dehydration column is switched for pressure relief and recovery and regeneration, an original secondary molecular sieve dehydration column contacting with the raw material becomes a primary molecular sieve dehydration column contacting with the raw material, and the standby molecular sieve dehydration column becomes a secondary molecular sieve dehydration column contacting with the raw material. The molecular sieve dehydration method has the advantages of good dehydration effect, small material loss and low energy consumption.

Description

technical field [0001] The present invention relates to the use of solid adsorption to refine hydrocarbon oil in the absence of hydrogen, in particular to a method for dehydrating dimethyl ether. Background technique [0002] At present, in petrochemical or coal chemical enterprises, the water content of dimethyl ether products is 150-300 μg / g due to the factors of the upstream equipment process. When dimethyl ether is used as the feed of a specific chemical plant, the water content is required to be less than 5 μg / g. If the water content is too high, it will have an adverse effect on downstream equipment or products. Therefore, dimethyl ether needs to be dehydrated before entering the downstream device. [0003] Molecular sieve is a kind of aluminosilicate, which is mainly composed of silicon and aluminum connected by oxygen bridges to form a hollow skeleton structure. In the structure, there are many channels with uniform pore size and well-arranged holes with large inter...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C43/04C07C41/36B01J20/34
CPCY02P20/10
Inventor 孙秋荣汤红年
Owner SINOPEC GUANGZHOU ENG CO LTD