3,5-Di-Tert-Butylbenzenesulfonic Acid Process With HCl Pretreatment

Solution Overview

Problem

The production of 3,5-di-tert-butylbenzenesulfonic acid involves significant formation of side-products like 1,3-propanedisulfonic acid, 2-methylene-, requiring expensive purification steps due to the use of 1,3,5-tri-tert-butylbenzene as a starting material.

Innovation Solution

Exposing a solution of 1,3,5-tri-tert-butylbenzene to anhydrous hydrogen chloride gas before reacting with a sulfonating agent suppresses the formation of 1,3-propanedisulfonic acid, allowing for the recovery of high purity 3,5-di-tert-butylbenzenesulfonic acid through filtration without additional purification steps.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If 1,3,5-tri-tert-butylbenzene is used as starting material for sulfonation, then the production cost is reduced, but significant formation of side-products like 1,3-propanedisulfonic acid occurs requiring expensive purification steps

Engineering Contradiction:

Improvestarting material costVSAvoidproduct purity

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The patent applies preliminary action by exposing the starting material to anhydrous hydrogen chloride gas before the sulfonation reaction. This pre-treatment modifies the starting material in advance to prevent side-product formation during the subsequent sulfonation step, thereby achieving high purity product while using the cost-effective 1,3,5-tri-tert-butylbenzene starting material

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent uses anhydrous hydrogen chloride as an intermediary substance that mediates between the starting material and the sulfonating agent. The hydrogen chloride forms a complex with the starting material that directs the sulfonation reaction to produce only the desired product, preventing side-reactions and eliminating the need for expensive purification steps

Inventive Principle:

Principle #24Intermediary (Mediator)

2Device complexity

If conventional sulfonation process is used without HCl treatment, then the process is simpler, but expensive purification steps are required to remove side-products

Engineering Contradiction:

Improveprocess complexityVSAvoidpurification cost

Core Design Contradiction:

Device complexityVSEase of manufacture

Solution Approach 1:

The patent applies preliminary action by exposing the starting material to anhydrous hydrogen chloride gas before the sulfonation reaction. This pre-treatment modifies the starting material in advance to prevent side-product formation during the subsequent sulfonation step, thereby achieving high purity product while using the cost-effective 1,3,5-tri-tert-butylbenzene starting material

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent uses anhydrous hydrogen chloride as an intermediary substance that mediates between the starting material and the sulfonating agent. The hydrogen chloride forms a complex with the starting material that directs the sulfonation reaction to produce only the desired product, preventing side-reactions and eliminating the need for expensive purification steps

Inventive Principle:

Principle #24Intermediary (Mediator)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The process achieves high purity 3,5-di-tert-butylbenzenesulfonic acid with reduced impurities, eliminating the need for costly purification processes and enhancing yield and purity through solvent selection and hydrogen chloride treatment.

Implementation Method 1

exposing a solution of 1,3,5-tri-tert-butyl benzene (TTBB) in a solvent to anhydrous hydrogen chloride gas prior to reaction with a sulfonating agent to produce 3,5-di-tert-butylbenzenesulfonic acid suppresses the formation of 1,3-propanedisulfonic acid, 2-methylene- (PDSA) as a side product

Methodology Applied

Scientific EffectChemical interaction: Chemical Bonding

Implementation Method 2

the solvent is selected to provide solubility for the amount of 1,3,5-tri-tert-butyl benzene used; the solvent is selected to provide that 3,5-di-tert-butylbenzenesulfonic acid is substantially insoluble in the solvent

Methodology Applied

Scientific EffectSolubility: Solvation

Implementation Method 3

3,5-di-tert-butylbenzenesulfonic acid can be recovered by filtration

Methodology Applied

Scientific EffectFiltration: Filter (physical)

Data Source

PatentEP4444696B1Production process for 3,5-di-tert-butylbenzenesulfonic acid

Publication Date: 2025.11.26 THE CHEMOURS CO FC LLC

AI summary

A process for producing 3,5-di-tert-butylbenzenesulfonic acid includes forming a solution of 1,3,5-tri-tert-butyl benzene in a solvent, exposing said solution to anhydrous hydrogen chloride gas, and reacting 1,3,5-tri-tert-butylbenzene with a sulfonating agent to form 3,5-di-tert-butylbenzenesulfonic acid. Said exposing of said solution to anhydrous hydrogen chloride gas is carried out before reacting said 1,3,5-tri-tert-butylbenzene with said sulfonating agent. The process also includes recovering said 3,5-di-tert-butylbenzenesulfonic acid.