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

Application field

Background of the project

  Acetonitrile is an important organic chemical raw material widely used as a solvent or a reactant. It is often necessary to separate acetonitrile from water during solvent production or recycling. Since acetonitrile and water are azeotroped, the azeotropic point is 76.3 ° C under normal pressure, and the mass of acetonitrile is 84%, which cannot be achieved by ordinary rectification. The current separation methods are mainly (salted) extractive distillation, pressure swing distillation and membrane pervaporation dehydration.

Technical comparison

name

Membrane separation 
(film + atmospheric distillation)

Pressure swing distillation 
(reduced distillation + pressurized distillation)

Steam (t/t raw material)

1.2

2.5

Circulating water (m3/t raw material)

50

250

Low temperature water (m3/t raw material)

4

20

Frozen water (m3/t raw material)

5

0

Electricity (kWh/t raw material)

30

20

Operating cost (yuan/t raw material)

287

580

Yield (%)

High, ≥97

Low, 90~93

Number of distillation towers

1

2

Maximum operating pressure (MPa(G))

0.2

0.3~0.4

Required steam pressure (MPa(G))

≥0.4

0.6~0.7

Operational complexity

Simple, automatic control

Complex, multi-person operation

Equipment investment

Relatively high

low

Annual operating cost (measured by 10m3 per day, 250 days per year, ie 2000 tons/year)

Energy consumption savings of 600,000 yuan; yield increase savings of >800,000 yuan / year (according to acetonitrile 10,000 yuan / ton), total savings of more than 1.4 million yuan / year

 

Process selection

recommend

Not recommended

.