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Hexachlorobenzene

Hexachlorobenzene structure

CAS No:
118-74-1
Formula:
C6Cl6
Chemical Name:
Hexachlorobenzene
Synonyms:
Benzene,1,2,3,4,5,6-hexachloro-;Benzene,hexachloro-;1,2,3,4,5,6-Hexachlorobenzene;Bunt-cure;Bunt-no-more;Anticarie;HCB;Hexachlorobenzene;Julin's carbon chloride;No Bunt;No Bunt 40;No Bunt 80;No Bunt Liquid;Perchlorobenzene;Sanocide;Amatin;Co-op Hexa;Pentachlorophenyl chloride;Snieciotox;Zaprawa nasienna sneciotox;HCB (pesticide);NSC 9243;BHC;1135443-45-6
Categories:
Organic Chemistry > Hydrocarbons and Derivatives

Description

White powder Hexachlorobenzene is a solid, crystallizing in nee dles.ChEBI: A member of the class of chlorobenzenes that is benzene in which all of the hydrogens are replaced by chlorines. An agricultural fungicide introduced in the mid-1940s and formerly used as a seed treatment, its use has been banned since 1984 under the Stock olm Convention on Persistent Organic Pollutants. hexachlorobenzene: A colourlesscrystalline compound, C6Cl6; m.p.227°C.

Hexachlorobenzene Basic Attributes

Molecular Weight：

284.78

Exact Mass：

284.78

EC Number：

204-273-9

HScode：

2903920000

Characteristics

PSA：

XLogP3：

5.5/6.2

Appearance：

Hexachlorobenzene appears as a white crystalline substance. Insoluble in water and denser than water. Contact may irritate skin, eyes and mucous membranes. May be toxic by ingestion. Used to make other chemicals.

Density：

2.044 g/cm³ @ Temp: 23 °C

Melting Point：

231.8 °C

Boiling Point：

325 °C

Flash Point：

11 °C

Refractive Index：

1.5691 (estimate)

Water Solubility：

Solubility in water, g/100ml at 20°C: 0.0000005

Storage Conditions：

APPROX 4°C

Vapor Pressure：

Vapour pressure, Pa at 20°C: 0.001

Vapor Density：

9.8

Toxicity：

Oral-rat LD50: 10000 mg/kg; Oral-Mouse LD50: 4000 mg/kg

Flammability characteristics：

Combustion produces toxic chloride gas

Safety Information

Packing level：

III

Hazard category：

6.1(b)

Transport codes：

UN 2729 6.1/PG 3

wgk germany：

hazard class code：

45-48/25-50/53-67-65-62-51/53-48/20-38-11-39/23/24/25-23/24/25-66-36/38-36

safety instructions：

53-45-60-61-62-36/37-33-29-16-9-26

RTECS Number：

DA2975000

Marks：

T,N,Xn,F,Xi

Storage features：

The warehouse is ventilated, low temperature and dry; stored and transported separately from food materials

Stability/Shelf Life：

Stable. Incompatible with strong oxidizing agents.

Precautionary statement(s)：

P201-P210-P273-P280-P304 + P340 + P312-P308 + P313

Hazard Statements：

H225-H319-H336-H350-H411

Toxicity

Toxicity class：

moderately toxic

Hexachlorobenzene Use and Manufacturing

Methods of Manufacturing

In industrial production, HCB is mainly produced by direct chlorination of benzene or lower chlorobenzene. Low-level chlorobenzene mainly refers to the by-product dichlorobenzene produced in the production of monochlorobenzene and trichlorobenzene obtained from the ineffective system of hexachlorobenzene. It can also be obtained by direct chlorination of the ineffective body of six six six. 1. Trichlorobenzene Chlorine method heats trichlorobenzene to 110℃, keeps it dry for 1h, can chlorinate with chlorine gas, release heat during reaction, the initial temperature is 100-120℃, the final temperature is 260-270℃, and the chlorination is 10- At 14h, when the temperature starts to drop, it means that the chlorination reaction has reached the end, stop the chlorine passing, put the molten material into the crystallization tank holding water, and stir to crystallize hexachlorobenzene into granules. Wash with cold water to get hexachlorobenzene. 2. Six-six-six invalid body direct chlorination method The invalid body is dried by hot air until the water content is below 1%, added to the melting kettle, heated to 150-170°C to melt, and then added to the scrubber and chlorination tower. The temperature of the scrubber is maintained at 210-230°C. After the chlorination tower is ventilated with chlorine, the temperature is gradually increased according to the heat of reaction, and the rate of chlorine passage is controlled to increase the reaction temperature by 2-3°C per hour. The chlorine-containing tail gas from the chlorination tower is passed into the scrubber for absorption and then sent to the by-product hydrochloric acid system. When the chlorination temperature reaches 260-270°C, it is quickly placed in a crystallization tank containing water and quenched for crystallization to obtain the finished product.

Uses

In organic syntheses.Formerly as agricultural fungicide.

Computed Properties

Molecular Weight:284.8
XLogP3:5.7
Exact Mass:283.810166
Monoisotopic Mass:281.813116
Heavy Atom Count:12
Complexity:104
Covalently-Bonded Unit Count:1
Compound Is Canonicalized:Yes

Material

Hydrochloric acid