Meta Base Ester

Product name: Meta Base Ester

Chemical name: 2-[(3-aminophenyl)sulphonyl] hydrogensulphate

CAS: 2494-88-4

Synonys: Meta Base VS

MW: 281.3

MF: C8H11NO6S2

Use: It is mainly used as intermediate of dyes.

Package: 25kg plastic woven bag


Specifications of Meta Base Ester:

Items Standards Results
Appearance Grey solid Grey solid
Content 80% 80.3%
Moisture 0.5% 0.35%
Ash 0.5% 0.38%
pH 5-8 6

Introductions of Meta Base Ester:

Meta Base Ester is an important intermediate of dyestuff. It can be used to make azo dyestuff, such as direct green lotus R, direct sun resistant ash 2BL, direct acid resistant violet, direct peach red, direct copper dye navy blue, sun resistant blue B2R, reactive scarlet, brilliant orange, grass green and red brown, and scarlet acid and phenyl j acid.


Meta Base Ester used to be prepared from β – naphthylamine. Due to the strong carcinogenicity of β – naphthylamine, this production method has been eliminated. Now, 2-naphthylamine-1-sulfonic acid (Tobias acid) is used as raw material to prepare J-acid. After sulfonation and hydrolysis, 2-naphthenic-5,7-disulfonated monosodium salt (amino J acid) was obtained, and then neutralized, alkali melted and acidified.


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