N-Ethyl-N-benzylaniline-3'-sulfonic acid

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Colorants & Intermediates

N-Ethyl-N-benzylaniline-3'-sulfonic acid

Alias: EBA-3S / B sulfonic acid / 3-[(Ethylphenylamino)methyl]benzenesulfonic acid / N-Ethyl-N-benzyl-m-aminobenzenesulfonic acid / N-Ethyl-N-(3'-sulfobenzyl)aniline / 3-[(Ethyl(phenyl)amino)methyl]benzenesulfonic acid / N-Ethyl-N-(3-sulfobenzyl)aniline / N-Ethyl-N-benzyl(3'-sulfonic acid)aniline / EBAMSA
CAS No.
Molecular Formula: C₁₅H₁₇NO₃S

Structure

Product Details

Product Overview

Product Summary

N-Ethyl-N-benzylaniline-3'-sulfonic acid, also known as B sulfonic acid, has molecular formula C15H17NO3S, molecular weight 291.37 and CAS number 101-11-1. It appears as a white to off-white powder with a content (titration) of ≥95.0%, alkali-insoluble matter ≤0.5%, a pH of 2.0-4.0 for a 1% aqueous solution and iron (Fe) ≤50 mg/kg (see specifications). The molecule carries both a tertiary amine structure and a sulfonic acid group: the sulfonic acid group confers water solubility and fiber affinity on the dye, while the tertiary amine serves as a chromophore precursor (finished-dye performance is subject to testing of the finished dye). The product is supplied in 25 kg woven bags with a polyethylene liner for the synthesis of triphenylmethane and azo acid dyes.

Usage

Used in dyes and fine chemicals as an important intermediate for synthesizing acid dyes. The molecule contains both a tertiary amine structure and a sulfonic acid group — the sulfonic acid group confers water solubility and fiber affinity to the dye, while the tertiary amine serves as an important chromophore precursor. Primarily used in the synthesis of triphenylmethane and azo acid dyes, and commonly used for acid dye varieties that require water solubility (fastness figures follow the finished dye's test data). This intermediate can also be used in the synthesis of surfactants and other functionalized aromatic compounds.

Applications

Applications by Industry

Triphenylmethane Acid Dye Synthesis

Used in triphenylmethane acid dye synthesis; the sulfonic acid group brings water solubility and the tertiary amine structure serves as a chromophore precursor (finished-dye performance is subject to testing of the finished dye). Verification focuses on content (titration ≥95.0%) and alkali-insoluble matter (≤0.5%) (see specifications) and can be reviewed item by item before charging; specific routes follow the customer's process.

Azo Acid Dye Synthesis

Used in azo acid dye synthesis; acid dye varieties that require water-soluble structures commonly use sulfonated intermediates as raw materials (finished-dye performance is subject to testing of the finished dye), and batch data can be confirmed with our sales team during inquiry.

Surfactant & Functionalized Aromatic Synthesis

Also used in the synthesis of surfactants and other functionalized aromatic compounds; the method of introducing the sulfonic acid group and the reaction conditions follow published methods and the customer's process validation.

Specifications

Technical Specifications

Product Specifications
Appearance	White to off-white powder
Content (titration) %	≥95.0
Alkali-insoluble matter %	≤0.5
Moisture %	≤2.0
Iron (Fe) mg/kg	≤50
pH (1% aq. soln.)	2.0–4.0
Density g/cm³	1.221–1.341

Logistics

Packaging, Storage & Transport

Packaging

25 kg woven bag with polyethylene liner; custom packaging available upon request. Sample arrangements and order quantities can be discussed during inquiry, and regular batches are produced against the order schedule.

Storage

Store sealed in a cool, dry, well-ventilated place; protect from light and heat

Transport

Transport classification follows the goods transport appraisal report and the carrier's requirements

FAQ

Frequently Asked Questions

Does B sulfonic acid refer to this product?

In the industry this product is commonly called B sulfonic acid; aliases consistent with this structure include N-Ethyl-N-(3'-sulfobenzyl)aniline and 3-[(ethyl(phenyl)amino)methyl]benzenesulfonic acid. Quoting CAS number 101-11-1 in inquiries avoids confusion with other similarly named sulfonic intermediates.

What role does the sulfonic acid group play in the dye structure?

The sulfonic acid group confers water solubility and fiber affinity on the dye, and the tertiary amine structure serves as a chromophore precursor; its behavior in a specific dye structure is subject to testing of the finished dye.

What does a pH of 2.0-4.0 indicate?

The pH of a 1% aqueous solution is 2.0-4.0 (see specifications), consistent with the sulfonic acid structure; the acidity of the working medium follows the customer's process.

Why is the iron figure listed separately?

Iron (Fe) ≤50 mg/kg is listed as its own item in the specifications; production and release inspection follow the specifications on this page, and additional requirements on iron or other metal impurities can be discussed item by item during inquiry.

What packaging and order quantities are available?

Standard packaging is a 25 kg woven bag with a polyethylene liner, and custom packaging is available. Sample arrangements and order quantities can be discussed during inquiry; regular batches are produced against the order schedule.

What are the storage and transport requirements?

Store sealed in a cool, dry, well-ventilated place away from light and heat; transport classification follows the goods transport appraisal report and the carrier's requirements.