Rectifying technique of 1,1,1,2-tetrafluoroethane

A technology of tetrafluoroethane and trifluoro-monochloroethane, which is applied in the field of rectification process, can solve the problems of large consumption of cooling capacity, large loss of heat preservation, difficult control of refrigeration and transmission, etc., and achieves the advantages of reducing investment and reducing heat preservation loss. Effect

Active Publication Date: 2007-07-11
SHANDONG DONGYUE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The traditional rectification process generally adopts brine cooling at -20~-10°C, which not only consumes a lot of cooling capacity, but also has a large difference between the brine temperature and the ambient temperature, resulting in a large loss of heat preservation
At the same time, since the temperature of the brine is too low, refrigeration and transmission are not easy to control

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] A 1,1,1,2-tetrafluoroethane (R134a) rectification tower has a production capacity of 3600t / a, or 0.5t / h. Set the reflux ratio to 3.0

[0014] The data of the two working conditions of the reflux condenser at the top of the tower and the power consumption are listed in Table 1: (the comparative example is the traditional high energy consumption working condition, and the embodiment is the improved working condition of our company)

[0015] Table 1

[0016] project

[0017] It can be seen from Example 1 that the rectification tower can save 397.7kWh of electricity per hour by changing the temperature of the rectification tower from -14°C frozen brine to +30°C circulating water.

Embodiment 2

[0019] A certain 1,1,1,2-tetrafluoroethane (R134a) degassing tower has a production capacity of 3600t / a, or 0.5t / h. Set the reflux ratio to 3.0,

[0020] The data of the two working conditions of the cooling capacity and power consumption of the top reflux condenser are listed in Table 2:

[0021] Table 2

[0022] project

comparative example

Example 2

Tower top pressure (Mpa)

0.6

1.35

Pressure Vessel Rating

low pressure

low pressure

pressure vessel temperature

Medium-low temperature

medium temperature

Tower top temperature (°C)

+10

+45

Frozen (salt) water inlet temperature

(℃)

-14～-20

+30

Outlet temperature (℃)

+4

+36

[0023] R134a latent heat of vaporization

(kCal / kg)

44.9

38.9

Amount of refrigeration required (kCal / kg)

647280

560160

Insu...

Embodiment 3 and Embodiment 4

[0029] As described in Example 1, the difference is that the inlet temperatures of the circulating water are respectively +10°C and +40°C. Table 3 lists the corresponding data on the cooling capacity and power consumption of the overhead reflux condenser.

[0030] It can be seen from Examples 3 and 4 that the temperature of the circulating water inlet is adjusted from -14°C to +10°C and +40°C respectively, and 40.4kWh and 397.7kWh of electricity can be saved correspondingly per hour.

[0031] table 3

[0032] project

[0033] Actual cooling capacity

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PUM

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Abstract

This invention relates to a distillation technique of 1, 1, 2, 2-tetrafluoroethane (R134a). By modulating technique parameters and correspondingly adopting circulative water at a temperature range of 10~40 deg. C as cooling medium in the cooling procedure in the distillation system, coolant consumption can be lowered and investment on cooling facilities can be reduced.

Description

technical field [0001] The invention relates to a rectification process in the production of 1,1,1,2-tetrafluoroethane (R134a). Background technique [0002] In the chemical production process, there are many unit operations or processes that consume electricity and energy, such as compression process, rectification process, dehydration and drying process, cooling and condensation process, etc. If enterprises want to achieve sustainable development and take the road of circular economy, they must consider the issue of energy conservation, and the energy saving of the above-mentioned processes is an important aspect. [0003] The production of 1,1,1,2-tetrafluoroethane (R134a) generally includes reaction, HCL rectification, water alkali washing, degassing, rectification and other processes. After the acid gas is removed, the remaining acid gas is removed through a water-alkali washing system, and finally the impurity components are removed through a degassing tower and a rec...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): C07C17/383C07C19/08
Inventor于修源宋淑伟周志永孙森
OwnerSHANDONG DONGYUE CHEM