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Carbonylation Process of MDI: Aniline Oxidative Carbonylation Process

This article details the oxidative carbonylation process for producing MDI using aniline, developed by Asahi Kasei Corporation, highlighting the catalytic system, reaction conditions, steps involved, and advantages over traditional methods.

2024 07 12

Carbonylation Synthesis Process of MDI - Nitrobenzene Carbonylation Process

This article details the development and processes of MDI carbonylation synthesis, focusing on non-phosgene methods, catalyst usage, and separation techniques. Key insights from Arco and Mitsui Toatsu Chemicals' innovations are highlighted.

2024 07 11

Carbonylation Synthesis Process of TDI - Two-Step Method with Dimethyl Carbonate

This article explores Enichem's innovative two-step dimethyl carbonate method for synthesizing toluene diisocyanate (TDI) from amines, emphasizing its importance as a non-phosgene process and providing detailed examples of its efficiency and application.

2024 07 10

TDI Carbonylation Synthesis Process - Two-Step Carbon Monoxide Method

This article discusses the development of a new non-phosgene TDI synthesis process by Mitsui Toatsu Chemical Co., its collaboration with American Cyanamid, and the detailed carbonylation and decomposition steps involved in the production.

2024 07 09

Carbonylation Process of TDI - One-step Method

This article introduces the one-step carbonylation process for synthesizing toluene diisocyanate (TDI) from dinitrotoluene (DNT) and carbon monoxide (CO), highlighting key catalysts, reaction conditions, and yield improvements.

2024 07 08

Introduction to Optical Chemical Processes - Pressurized Production Process

This article introduces the pressurized production process of organic isocyanates, detailing the chemical reactions involved, the benefits of high-pressure methods, and the operational steps to achieve higher yields and improved efficiency.

2024 07 06

Synthesis of MDI

This article details the synthesis process of diphenylmethane diisocyanate (MDI), focusing on its isomeric forms, industrial applications in polyurethane foams, and the two-step process involving the condensation of MDA and its subsequent phosgenation.

2024 07 05

How is TDI synthesized?

This article details the synthesis of toluene diisocyanate (TDI) isomers, including the processes of nitration, reduction, and phosgenation, and highlights the specifications and methods for producing TDI-100, TDI-80, and TDI-65.

2024 07 03

Introduction to Optical Chemical Processes - Tower Continuous Production Process

2024 07 01

Introduction to the Optical Chemical Process – High-Temperature One-Step Process

This article introduces the high-temperature one-step phosgenation process for producing isocyanates, highlighting its advantages over the traditional two-step method, including improved reaction speed, reduced energy consumption, and higher product purity.

2024 06 29

Introduction to the Optical Chemical Process - Kettle-Type Continuous Production Process

This article introduces the kettle-type continuous production process in optical chemistry, highlighting its high output, equipment efficiency, and stable product quality, while also addressing its limitations such as high phosgene consumption and multiple phosgene recovery steps.

2024 06 28

Optical Chemical Technology - Kettle Batch Production Process

This article introduces the kettle batch production process for isocyanates, highlighting its simplicity and suitability for small-batch production, but also noting drawbacks like low equipment utilization, long cycles, and safety concerns.

2024 06 27

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Over 20 years of first-hand production and usage experience, our technology development team aims to make every machine exhibit the characteristics of simplicity, labor efficiency, ease of operation, and minimal maintenance.