主题：大连的PX项目终于停了！ -- fish197

http://www.cchere.com/article/3536488

很多讨论只把公众关注往毒性小上引导（从LD50上看的确毒 [ 小红炉 ] 于:2011-08-16 02:59:49 复:3534147 总阅:1769

性不是极大）。但其毒害仍然是无法否认的：

EMERGENCY OVERVIEW总则

Clear liquid澄清溶液

- FLAMMABLE LIQUID AND VAPOR易燃液体/蒸汽

- MAY CAUSE CNS DEPRESSION有可能抑制中枢神经系统

- HARMFUL OR FATAL IF SWALLOWED 吞咽可能致命

- CAN ENTER LUNGS AND CAUSE DAMAGE进入肺部，肺部损伤

- MAY CAUSE RESPIRATORY TRACT IRRITATION IF INHALED吸入呼吸道损伤

- VAPOR HARMFUL有害蒸汽

- CAUSES EYE IRRITATION眼部刺激

- MAY CAUSE AN ALLERGIC SKIN REACTION有可能皮肤过敏

- CAUSES SKIN IRRITATION皮肤刺激

- BIRTH DEFECT HAZARD - MAY CAUSE BIRTH DEFECTS 有可能造成出生缺陷- INHALATION MAY CAUSE NERVOUS SYSTEM EFFECTS 吸入可能找成中枢神经损伤

- CONTAINS MATERIAL THAT CAUSES CENTRAL NERVOUS SYSTEM EFFECTS

- MAY CAUSE DAMAGE TO:

- - - - - - AUDITORY SYSTEM

- HIGHLY TOXIC TO AQUATIC ORGANISMS对水生生物有高度毒性

另外，化工品的危险性不仅是毒害程度，还在于它是否易燃易爆品。他们是真的不懂呢，还是故意对PX本身是高危的易燃易爆品这个事实视而不见呢？

看看这个链接中引用的BP 自己出的产品说明书上是怎么说的吧：

http://bbs.taizhou.com/simple/index.php?t130198.html

SECTION 5 FIRE FIGHTING MEASURES

FIRE CLASSIFICATION:

OSHA Classification (29 CFR 1910.1200): Flammable liquid.NFPA RATINGS: Health: 2 Flammability: 3 Reactivity: 0

FLAMMABLE PROPERTIES:

Flashpoint: 27°C

(80.6°F) (Tag Closed Cup)

Autoignition: 466°C (870.8°F)

Flammability (Explosive) Limits (% by volume in air): Lower: 1.1 Upper: 7

注意黑体部分的意思是：

1.PX是3级可燃液体。

2.闪点为27°C. 就是说在达到相应浓度后，只要27°C就可以被点燃了。

3.爆炸极限为1.1-7%。液化石油气的爆炸极限是 1.5-9.5%。大家可以自行对比这个PX的危险程度。

SECTION 14 TRANSPORT INFORMATION

______________________________________________________________________

Revision Number: 24

Revision Date: 06/26/2007

6 of 9 Paraxylene

MSDS : 700

The description shown may not apply to all shipping situations. Consult appropriate Dangerous Goods Regulations, for

additional description requirements (e.g., technical name) and mode-specific or quantity-specific shipping requirements.

Shipping Descriptions per regulatory authority.

US DOT

UN1307, XYLENE , 3, III , RQ

ICAO / IATA

XYLENE, 3, UN1307, III

IMO / IMDG

XYLENE, 3, UN1307, III, (27°C )

RID / ADR

UN1307, XYLENE, 3, III, ADR

国际海运业也规定该产品的运输必须按照3.3级危险品要求进行。

SECTION 7 HANDLING AND STORAGE

READ AND OBSERVE ALL PRECAUTIONS ON PRODUCT LABEL . REFER TO PRODUCT LABEL OR MANUFACTURERS

TECHNICAL BULLETINS FOR THE PROPER USE AND HANDLING OF THIS MATERIAL .

Precautionary Measures: This material presents a fire hazard. Liquid quickly evaporates and forms vapor (fumes) which

can catch fire and burn with explosive violence. Invisible vapor spreads easily and can be set on fire by many sources

such as pilot lights, welding equipment, and electrical motors and switches. Fire hazard is greater as liquid temperature

rises above 15°F. Do not breathe vapor or fumes.

实际上在温度高于华氏15度时，起火危险就在增加。

总体来说，如果是严格按照要求操作，再危险的化工品在平时对于操作人员和公众的危险性都会降低。但人们更关心的是出现意外、出现事故会有多大危害。

PX如果发生泄漏，不单是对人体和海域水产品的毒害问题，更可怕的是其相当低的闪点容易导致的大火或者爆炸。如果不幸被别的易燃易爆品发生事故时产生的大火或者爆炸波及，那PX可不会客气。特别是那么大的储罐，其威力会有多大，我现在量化不出来。

至于用于PX生产的原材料以及副产品之类，可以自己查他们的MSDS，进行类似分析。