Unlock instant, AI-driven research and patent intelligence for your innovation.

A method for dehydration of molecular sieves with carbon four fractions

A carbon four fraction and molecular sieve technology, applied in the field of carbon four fraction molecular sieve dehydration, can solve problems such as poor applicability and adverse effects on factories, and achieve the effects of reducing consumption, reducing energy consumption, and reducing material loss

Active Publication Date: 2017-08-22
SINOPEC GUANGZHOU ENG CO LTD +1
View PDF4 Cites 0 Cited by
  • 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
[0009] "Modern Chemical Industry", 2003, 23(12), 38-40, Application C 4 + The liquid phase dehydration technology of mixed light hydrocarbons is used to transform the natural gas processing equipment. Three adsorption towers filled with 4A molecular sieves are used, two are connected in series, and one is used for dehydration. The C4 + The water content of mixed light hydrocarbons is less than 10×10 -6 Quality content, the background of this article is a natural gas company, using dry gas to regenerate 4A molecular sieve, but for petrochemical companies, the applicability is not strong

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A method for dehydration of molecular sieves with carbon four fractions
  • A method for dehydration of molecular sieves with carbon four fractions
  • A method for dehydration of molecular sieves with carbon four fractions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The raw material composition of C4 fraction is shown in Table 1. The processing capacity is 10000kg / h, the operating elasticity is 60-110%, and the density is 540kg / m 3 , Operating temperature: 40°C, operating pressure: 1.5MPa(G).

[0038] Table 1 Composition of C4 fraction feedstock

[0039] name mass percentage propane 1.06 n-butane 5.15 Isobutane 0.22 Butene 17.4 Isobutylene 0.07 Butene 30.23 Anti-butene 45.53 Butadiene 100ppm carbon five 0.12 Methanol 0.01 tert-butanol 0.01 water 300ppm Dimethyl ether 0.11 total 99.91

[0040] The content of propane and C4 olefins in the C4 fraction is 76.89% by mass, the filling ratio of the upper part 3A and the lower part 4A in the molecular sieve dehydration tower is 6:4, the effective adsorption capacity of the 3A molecular sieve is 5% by mass, and the effective adsorption capacity of the 4A molecular sieve is 7 % mass percen...

Embodiment 2

[0048] The raw material composition of C4 fraction is shown in Table 2. The processing capacity is 10000kg / h, the operating elasticity is 60-110%, and the density is 545kg / m 3 , Operating temperature: 40°C, operating pressure: 1.5MPa(G).

[0049] Table 2 Composition of C4 fraction feedstock

[0050]

[0051]

[0052] Propane and carbon four olefins content 50.44% mass percent in the C4 fraction, the filling ratio of upper part 3A and lower part 4A in the molecular sieve dehydration tower is 5: 5. The effective adsorption capacity of 3A molecular sieve takes 5% mass percent, and the effective adsorption capacity of 4A molecular sieve takes 7% by mass, the filling height-to-diameter ratio of the molecular sieve dehydration tower is 4:1, calculated on the basis of 7 filling switches in a single tower, the inner diameter of the molecular sieve dehydration tower is 1.8m, and the filling height of the molecular sieve dehydration tower is 7.2m.

[0053] Three molecular sieve ...

Embodiment 3

[0060] The raw material composition of C4 fraction is shown in Table 3. The processing capacity is 10000kg / h, the operating elasticity is 60-110%, and the density is 545kg / m 3 , Operating temperature: 40°C, operating pressure: 1.5MPa(G).

[0061] Table 3 Composition of C4 Fraction Feedstock

[0062] name Mass percentage (wt%) Propylene 0.06 propane 0.08 n-butane 9.06 Isobutane 42.43 Butene 13.13 Isobutylene 0.57 Butene 16.02 Anti-butene 18.52 carbon five 0.003 Methanol 0.005 tert-butanol 0.01 water 500ppm Dimethyl ether 0.05 total 100.0

[0063] The content of propane and C4 olefins in the C4 fraction is 48.38% by mass, and the filling ratio of the upper part 3A and the lower part 4A in the molecular sieve dehydration tower is 4:6. The effective adsorption capacity of the 3A molecular sieve is 5% by mass, and the effective adsorption capacity of the 4A molecular sieve is 5% by...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a molecular sieve dehydration method for a C-4 fraction. 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 invention relates to refining hydrocarbon oil by solid adsorption in the absence of hydrogen, in particular to a method for dehydrating carbon four fraction molecular sieves. Background technique [0002] At present, in petrochemical or coal chemical enterprises, due to the factors of the upstream device process, such as the use of water to extract methanol to separate the C4 fraction in the MTBE device, the C4 fraction will carry water. After dehydration by the coalescer, the water content of the C4 fraction is 300~500μg / g. When the C4 fraction is used as a raw material for a downstream device, there is a relatively high requirement for its water content. For example, as a raw material for an alkylation unit or an olefin polymerization unit, the water content is required to be less than 5 μg / g. Therefore, if the water content of the C4 fraction is too high, it will It affects the operation of downstream devices or product quality, so the C4 fract...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): B01D15/00B01J20/34C07C7/13
Inventor 孙秋荣汤红年
Owner SINOPEC GUANGZHOU ENG CO LTD