国内精品在线观看看_成本人妻片无码中文字幕免费_污网站日本永久免费_a√片免费大全在线观看不卡

鹽城三禾生物科技有限公司

Yancheng Sanhe Biochemical Co., Ltd.

PRODUCTS

Sanhe Biochemical

1,4-dibromobenzene

Product name 1,4-dibromobenzene
English alias p-Dibromo Benzene
Structural formula
Molecular formula C6H4Br2
Molecular weight 235.90400
Appearance White to light yellow crystalline powder
Melting point 86-89 ℃
Relative density 1.84
Boiling point 219 ℃
Water solubility Insoluble.
Refractivity 1.5742
Content ≥99.0%
Moisture ≤0.05%
Stability Stable. Combustible. Incompatible with strong oxidizing agents.
Flash point 219-220℃
Vapor pressure 10 mm Hg ( 40 ℃)
Storage Ventilation and low-temperature drying in the warehouse
Use This product is used in organic synthesis and can also be used as a dye intermediate.
Production method Add 2g of iron filings to 1mol of benzene and slowly add bromine dropwise. Generally, the reaction begins after 15 minutes (slow boiling), and the bromine addition rate is controlled to maintain a slight boiling of the reactants. After adding bromine, heat at 20-30 ℃ for 1 hour, then heat at 60 ℃ for 45 minutes until the brown vapor of bromine disappears. Filter out the iron filings, wash them with water, and then steam them. The brominated benzene distilled from the first part is removed from the water layer, dried with calcium chloride, and then distilled. The main fraction collected at 150-170 ℃ is brominated benzene. The residue after distillation is poured into a porcelain dish while hot, condensed, and combined with the p-dibromobenzene obtained from steam distillation. After drying, it is recrystallized with activated carbon and methanol to obtain 24g of p-dibromobenzene with a yield of 10%.
UN No. UN 2711
Hazard class 9
Packing group III
HS code 29036990
Packing 25KGS/cardboard drum
CAS # 106-37-6

[ BACK ]

SANHE BIOCHEMICAL

HOME  |   ABOUT US  |   PRODUCTS  |   NEWS  |   FACTORY  |   HONORS  |   CONTACT  |   中文版

Copyright(C)2024, Yancheng Sanhe Biochemical Co., Ltd. All Rights Reserved. Supported by Sunsirs ChemNet Toocle Copyright Notice 備案序號(hào):蘇ICP備18016072號(hào)