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ZIP:324000
TEL:+86-570-3865703
FAX:+86-570-3865781
SITE:www.dshtech.cn
E_MAIL:dshchem@aliyun.com
ADD:NO.75 ,Fushi Road,Quzhou City,Zhejiang Province,China

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( HFC-32) using the raw materials of

Dichloromethane and hydrogen fluoride

 

 

 

 

1. Product Introduction

    Product Name: Difluoromethane, HFC-32

    English Name: Difluoromethane, R-32

    Molecular Formula: CH2F2

    Formula Weight:52.02

    Physicochemical Property: Difluoromethane in normal temperature is a slightly eater flavor colorless gas. Under itself pressure, it is colorless transparent liquid and easily soluble in oil, hardly soluble in water. Its boiling point:(an atmosphere)=61.1℉(-51.7℃), specific gravity: (atmosphere=1)1.85, freezing point/melting point( an atmosphere):213.0℉(-136.1℃).Storage cylinder can not be exposed at over 125(52) atmosphere, naked light or other fires( need to avoid materials): oxidant, alkali or alkali earth metal,such as aluminite powder, zinc etc.This material decomposes in high temperature( naked light or heat metal surface)into hydrogen fluoride and maybe produce Fluoro carbonyl compounds.

    Usage: Difluoromethane is a cooling agency which has zero ozone depletion advantage. Difluoromethane reacts with pentafluoroethane can produce a constant boiling mixture(called R-410A). It can be used as chlorofluorocarbon fungible which used in new coolant system, mainly replace HCFC-22, used as a low temperature mixed cryogen.  Though it has zero ozone depletion advantage, it has high global warming trend. As the basis of 100 years , its potential is 550 times of carbon dioxide.

    Market Capacity: according to the Montreal convention and other protect ozonosphere conventions rules,it will strictly restrict to use ozonosphere pollution chemical materials. As R32 can replace some parts of relative products, it will have great developing space in global countries.Along with the developing of air condition,refrigerator and  industrial refrigeration, the market requirement capacity is about 250,000 to 270,000 tons in 2010. According to the National Project, the mixed - refrigerant requirement capacity is about 70,000 to 80,000 tons in 2010, mainly satisfy new refrigeration plant and CFCs equipment and refrigeration plant for exportation.

 

2. Technology and Process principle

    1. The Technical Principle

    Currently, the factories in domestic country all use dichloromethane react with AHF under effect of catalyst

    CH2Cl2 + HF     CH2ClF + HCl   

    CH2ClF + HF     CH2F2 + HCl   

    2CH2ClF      CH2F2+CH2Cl2 

 

     This fluoridation has gas phase method and liquid phase method:

     Gas phase method is to heat and vaporize AHF and dichloromethane, then through the catalyst layer( catalytic agent is solid, there are many factories research and develop in domestic).Use this method, the capacity is low, so only a few factories use it.

     Liquid phase method, which is dichloromethane CH2CL2and AHF liquid phase fluoridize in antimonic chloride SbCL5 reactor. The process is the same as traditional HCFC-22 process( including the equipment), only piping pressure grade is higher than HCFC-22 equipment. ( because HCF-32 boiling point is lower 10.9 than HCFC-22, HFC-32 boiling point is -51.7. We don’t use dry separation HCL process, because of the requirement of Cryogenic temperature is low, -35saline water is not enough)

    Process block diagram:

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3. The requirement to the raw materials

    1. Dichloromethane: Industrial grade

    2. Hydrogen fluoride: Industrial grade

    3. Antimonic chloride: Industrial grade

 

 

4. Tons products’ raw materials and energy consumption

No.

Name

Unit consumption

Unit

1

hydrogen fluoride

0.9

t

2

Dichloromethane

2.04

t

3

Water

260

t

4

Vapour

1.4

t

5

Electricity

240

kwh

 

5. Dingsheng company’s technical Service contents

    Dingsheng company’s technical Service contents as following:

1. Process design

1.Using standard list in engineering design

2. Process diagram

3. Process and Pipping flowsheet(P&I D)

4. Raw materials(auxiliary materials), public engineering instruction

5. Products and main byproducts quality specification instruction

6. Materials equilibrium diagram

7. Energy equilibrium diagram

8. Stream information diagram

9.  Pipping schedule

10. Valve schedule

11.Heat and cold insulation Technical Condition of equipment and pipping

12. The main arrangement project of factory ( or workshop)

2. Equipment

1.The schedule of main equipment names and quantities

2. Outsourcing equipments data sheet

3.The arrangement diagram of equipment level elevation

4. All non-standard equipment condition diagram

5. Equipment motive power schedule

6. Equipment technical specification schedule

7.Outsourcing equipment specification list

8. Equipment spare parts

4. Process operation manual

1. Process designing instruction

2. The handbook of factory starting, running and stopping

3. The operation condition and parameter of process

4. The suggestion of accident prevention and environment protection

5. The list of Maintenance regulation, inspection frequency and relative data

6. All index analytical method of products and raw materials

7. MSDS of raw materials and products

8. Test Running project

3. Electric and instrument

1.Electric condition list

2. Instrument condition list

3.Electric installing requirement

4. The load data of electric motor list, connecting and running

5. Electric connecting diagram

6. The chain system diagram of electric and instrument

7. Cable specification list

8. Instrument designing data list

9. Instrument data wire specification list

10. DCS configuration instruction

5.Engineering and structure project

1. All equipment load data and bracing structures with materials

2. The antiseptic suggestion of buildings and structures

3. Equipment basic designing data

4. The antiseptic suggestion of underground pipping

 

    1. Technical exchange of preliminary design and detail engineering design

    2. Revise some preliminary design according to  owners’ actual condition

    3. Check and accept detail engineering diagram and data

    4. Technical disclosure before equipment installing

    5. Assist workers training according to the operation manual

    6. Assist production line test running

    7. Assist capability testing to the production line

    8. Other services required from owners within contract

 

TEL:+86-570-3865782  SITE:www.dshtech.cn ADD:NO.75 ,Fushi Road,Quzhou City,Zhejiang Province,China
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