Jiangsu Nine Heaven High-tech Co.,LTD     苏ICP备12062187号-1    power by www.300.cn 

Application field

Background technique

Tetrahydrofuran is widely used as a solvent, a raw material for organic synthesis, and a pharmaceutical solvent, such as a format reagent. Tetrahydrofuran can form an azeotrope with water (5.3% water) during production and use. Generally, it uses desiccant for dehydration recovery (such as alkali and salt water absorption). It has complicated operation, high energy consumption, serious pollution and low yield. It is difficult to obtain a high purity solvent.

Technical comparison

 

Film dehydration

Calcium chloride dehydration

Pressure swing distillation

Number of distillation towers

0

1~3

2

Operating pressure MPa (G)

0.15~0.25

Atmospheric pressure

High pressure tower: ≥0.4 
low pressure tower: atmospheric pressure

Steam consumption t/t raw material

0.32

0.3

1.5

Circulating water (32 ° C) consumes m 3 /t/ raw material

19

15

80

Low temperature water (15 ° C) consumption m 3 /t / raw materials

3

2

6

Chilled water (-3 ° C) consumes m 3 /t/ raw material

18

-

-

Power consumption kWh / t raw materials

10

2

6

Calcium chloride consumption yuan / t raw materials

-

170

-

Processing cost yuan / t raw materials

97.3

236

325

Operational complexity

Continuous operation, high degree of automation, one-person operation

Intermittent operation, high labor intensity, need to clean the tower kettle regularly

Continuous operation, open and stop process is complicated, and the workload is large

safety

Self-controlled chain, safe

Safer

The pressure of the high pressure column is higher, and the concentration of tetrahydrofuran in the column is higher, and the safety is lower.

Equipment requirements

No special requirements

Equipment and piping are resistant to chloride ion corrosion

High pressure tower operating pressure is high, requiring high equipment and sealing

Process disadvantage

no

Produce more chlorine-containing waste liquid and waste residue

The open parking process is complicated, the safety is low, the liquid circulation is large, and the energy consumption is high.

 

.