强奷乱码中文字幕乱老妇_国产视热频国只有精品_无码中文字幕人妻在线一区_久久九九久精品国产

3,5-Dihydroxybenzoic acid alias alpha resorcinol acid, white or pale pink crystal. Soluble in ethanol, ethyl ether, acetone and water to generate purple compounds with concentrated sulfuric acid fuming sulfuric acid or heat, a wine with ferric chloride effect. Mainly used as organic synthesis intermediates, used in pharmaceutical, synthetic resin, etc..

Acid 3,5-Dihydroxybenzoic

Alias alpha resorcinol acid

CAS No. 99-10-5

Molecular formula C₇H₆O₄

Molecular weight 154.12

Melting point 235-240

Boiling point 411.5

The flash point of 216.8 DEG C

The content is more than 98%

Properties: white crystal powder, soluble in alcohol, ether and water, in case of FeCl3 turns pink.

synthetic method

It was obtained by the sulfonated, alkali fusion and acidification of benzoic acid. Benzoic acid with fuming sulfuric acid at 240~250 deg.c sulfonated 5h, generate 3,5- two sulfonic acid benzoic acid, and sodium hydroxide at 300 deg.c alkali fusion, the reaction product of sulfuric acid to weak alkaline, filtered and concentrated, then acidified to weak acid extracted with ether. The crude product obtained from the extraction liquid is recovered from the crude product by using the water.

purpose

Organic synthetic intermediate, used in pharmaceutical, synthetic resin, etc..

Storage method

Store in a cool, ventilated warehouse. Away from the fire, heat source. Packing seal. Should be stored separately with oxidant, alkali, avoid mixing reservoir. Fire fighting equipment with corresponding variety and quantity. The storage area should be equipped with appropriate material containing leakage.

Packing

Cardboard drums lined with plastic bags, net weight of 25 kg per barrel.