Absorption section

The reaction products were absorbed by methanol evaporator into the absorption tower system。Containing formaldehyde gas, from the first absorption tower bottom absorber part is absorbing tower from the second to return to the absorption of fluid, part is returned from the own bottom flow solution, most of formaldehyde absorbed in the tower。The solution from the first absorption of the tartar, part of it as a reflux liquid, and part of it as a formaldehyde product。The first absorption tower overhead absorption of gas into a second absorption tower bottom continue to absorb, bottom effluent in addition to the part as its own backflow, the others all return to the first absorption tower as absorbent to absorb formaldehyde gas。The second absorbing gas from the tartar to the exhaust gas treatment system produces steam。 

Process parameters

(1) production capacity: 80000tHCHO

Annual production time: 7,800 hours

That's 10。26 tHCHO per hour

(2) ingredients: methanol (quality %) : w CH3OH = 8 w H2O = 92

Feed air (volume %) : v O2 = 21 v N2 = 77。24 v H2O = 1。76

(3) product of methanol solution (quality %)

Table 2。2 product composition of methanol solution (quality score)

Component HCHO CH3OH H2O

content 55。06 0。04 44。36 100。00

(4) reaction gas composition (%)

Table 2。3 (volume fraction)

O2 CO2 CO CH4 H2O H2 HCHO CH3OH N2

Content 0。2 3。6 0。4 0。2 0。04 0。16 66。4 100。00

(5) other technical parameters are required

Raw material: methanol temperature 22 ℃ oxygen alcohol than delta: 0。42

Methanol unit consumption e: 0。515 t / 1 t feed air temperature: 52 ℃

Concentration (quality %) : 70%

Design principles

The design principle includes: product quality control index, safety, operation convenience, investment province, easy installation etc。

In this design, the process route and production process of formaldehyde synthesis were determined by reviewing the relevant literature data。Then iron molybdenum catalyst for yearly produces 80000 tons of methanol synthesis formaldehyde process design tasks related to the material balance and heat balance, the control points of process flow diagram with AUTOCAD software rendering belt, workshop equipment layout, acrylonitrile fluidized bed reactor design and elevation layout, and compiling and writing the design specification。

目录

1引言 1

1。1 课题内容 1

1。1。1 课题来源 1

1。1。2 课题内容 1

1。2 甲醛产品介绍 1

1。2。1 性质 1

1。1。2 用途 2

1。2。3 国内外需求产能 2