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Emergency plan text 4
3 Environmental risk sources and environmental risk assessment
3.1 Environmental risk identification and analysis
3.1.1 Identification of material hazards
The properties of the company's main materials are shown in Table 3-1.
Table 3-1 List of material properties
|
Serial number |
Substance name |
Phase state |
Flash point ℃ |
Boiling point ℃ |
Explosion limit% (v) |
Risk category |
Risk of combustion and explosion |
Classification of fire hazards |
toxicity |
Poison classification |
||
|
Cap |
Lower limit |
LD50
mg/kg |
LC50
mg/m3 |
|||||||||
|
1 |
Methanol |
Fluid |
11 |
64.8 |
44 |
5.5 |
Flammable liquid with flash point in Class 3.2 |
7.0 |
A B |
5628 |
83776 |
Ⅲ |
|
2 |
Triethyl phosphite |
Fluid |
54 |
156.6 |
— |
— |
Class 3.3 High flash point flammable liquid |
— |
CA |
3200 |
— |
Ⅲ |
|
3 |
Ethyl chloride |
Angry |
-43 |
12.5 |
14.8 |
3.6 |
Class 2.1 Flammable gases |
3.1 |
AB |
10748 |
160000 |
Ⅳ |
|
4 |
Sodium methoxide |
solid |
— |
＞450 |
— |
— |
Class 8.2 Alkali Corrosives |
— |
C |
— |
— |
Ⅲ |
|
5 |
Dimethyl sulfoxide |
Fluid |
95 |
189 |
42 |
0.6 |
Class 3.3 High flash point flammable liquid |
69 |
DA |
9700～28300 |
— |
Ⅳ |
According to Table 3-1, the fire hazards of methanol, ethyl chloride, and the like in the screening risk materials belong to Class A and B, the fire hazard of triethyl phosphite belongs to Class A, and the fire hazard of sodium methylate belongs to Class B. The fire hazard of dimethyl sulfoxide belongs to category C.
From the perspective of hazard characteristics and acute toxicity levels: Grade III toxic substances include methanol, triethyl phosphite, and sodium methoxide; grade IV toxic substances include ethyl chloride and dimethyl sulfoxide.
Sodium methoxide is corrosive.
The raw materials used by Shenyang Xinxiang Chemical Co., Ltd. are only soda ash and urea, both of which are solid raw materials. The above risks are small, but the ammonia produced by the reaction has the risk of improper recovery, which may have an impact on the environment and should be controlled.
3.1.2 Production facility risk identification
See Table 3-2 for the process parameters of each production facility in the factory area, and Table 3-3 for the storage of raw materials and materials in the storage area.
Table 3-2 Details of process parameters of production facilities
|
Product and process names |
Device name |
Volume (m3) |
Quantity |
Content name and phase |
Contents |
Temperature (℃) |
Pressure (Mpa) |
火灾
爆炸
类别 |
毒物
危险
类别 |
是否重大危
险源 |
|
Esterification process |
Esterification reactor |
3 |
3 |
Esterification reaction mixture / liquid |
8.2
4.6
3.3
0.3 |
50~140 |
Atmospheric |
B |
Ⅲ |
No |
|
Esterification refining kettle |
3 |
1 |
Esterification reaction mixture / liquid |
8.2 |
90~200 |
Atmospheric |
B |
Ⅲ |
No |
|
|
Condensation process |
Condensation reactor |
3 |
8 |
Condensation reaction mixture / liquid |
21.6
5.0
4.6
1.3
10.7 |
25~70 |
Atmospheric |
B |
Ⅲ |
No |
|
Refined drying tank |
2.6 |
4 |
CF-351 aqueous solution / liquid |
10.5
6.3
4.2 |
20~90 |
Atmospheric |
B |
Ⅲ |
No |
|
|
Solvent recovery |
Sulfoxide distillation column |
- |
2 |
Sulfoxide |
3.1 |
|
Atmospheric |
B |
Ⅳ |
No |
|
Methanol distillation tower |
- |
1 |
Methanol |
0.72
0.04 |
|
Atmospheric |
A |
Ⅲ |
No |
表3-3 原料存放量明细表
|
Serial number |
raw material name |
Storage method |
Storage capacity (ton) |
storage location |
Fire explosion category |
Toxic hazard category |
Is it a major hazard |
|
1 |
Triethyl phosphite |
Barrel |
40 |
Shed |
B |
Ⅲ |
No |
|
2 |
Benzaldehyde o-sulfonic acid |
Barrel |
60 |
Shed |
B |
Ⅲ |
No |
|
3 |
Dimethyl sulfoxide |
Barrel |
50 |
Shed |
C |
Ⅳ |
No |
|
4 |
Sodium chloride |
Barrel |
10 |
Shed |
- |
Ⅲ |
No |
|
5 |
Sodium methoxide |
Barrel |
20 |
Dedicated warehouse |
B |
Ⅲ |
No |
The company's production process devices are all operated at atmospheric pressure. Except for methanol distillation kettles which are classified as Class A, the rest are classified as Class B, and the risk of fire and explosion is small.
3.1.3 Analysis of Accident Associated / Secondary Pollution and Chain Effects
In the event of a fire or explosion in a methanol distillation tower, the released methanol can endanger ambient air and human health.
Firefighting wastewater that is cooled down during a fire or explosion may contain hazardous materials, such as entering the environment through surface runoff, which will cause environmental pollution of surface water, soil and groundwater.
3.2 Identification of major hazards
Compared with the relevant provisions of the Standard for Identification of Major Hazardous Sources (GB18218-2009), the company does not have a major source of danger.
3.3 Environmental risks of dangerous targets and emergency prevention measures
Based on the above analysis conclusions and the characteristics of the company's possible environmental accidents, the following dangerous places (equipment) have been identified as dangerous targets for emergency rescue:
Target No. 1: Raw Material Warehouse in West Plant
Goal 2: Xinxiang workshop's ammonia three-stage absorption system and ammonia water storage system
3.3.1 Target 1 Environmental Risks and Emergency Preventive Measures
The main sources of danger for Target 1 are raw materials triethyl phosphite, sodium methoxide, methanol and dimethyl sulfoxide. See Appendix 6 for the properties and emergency treatment of the above chemicals.
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