1、KMC Study on Byproduct Formation in the Process of Acetylene to Vinyl

Kinetic Monte Carlo (KMC) was used to further study the main reaction and various side reactions in the process of producing vinyl acetate from acetylene. The effects of temperature, pressure, and molar ratio of acetylene/acetic acid on the reaction process were investigated.

2、Theoretical study on the synthesis of vinyl acetate from acetylene and

In this study, we used density functional theory (DFT) to calculate the feasibility of preparing vinyl acetate (VAc) on four CN non-metallic materials (C 2 N, C 3 N, C 4 N and C 5 N) under the reaction conditions of 1 atm, 393.15–493.15 K at B3LYP/6-31G (d, p) level.

3、(PDF) Vinyl Acetate Monomer Process

The following are the primary and side reactions: Figure 3 shows the salient features of the five plants and Table 1 summarizes the data for the chemical species contained in the internal...

Vinyl Acetate Formation in the Reaction of Acetylene with Acetic Acid

present study, a kind of porous carbon spheres (PCS) was synthesized and used for the first time to support zinc acetate (PCSZn). Encouraging results in the formation of vinyl acetate from acetylene and acetic acid are expected after employing.

Byproducts in Vinyl Acetate Production

Kinetic Monte Carlo (KMC) was used to further study the main reaction and various side reactions in the process of producing vinyl acetate from acetylene. The effects of temperature, pressure, and molar ratio of acetylene/acetic acid on the reaction process were investigated.

Catalytic routes and mechanisms for vinyl acetate synthesis

Here, we review studies on catalyst structure and reaction mechanisms for vinyl acetate synthesis via heterogeneous non-oxidative acetylene acetoxylation and homogeneous and heterogeneous oxidative ethylene acetoxylation.

KMC Study on Byproduct Formation in the Process of

Kinetic Monte Carlo (KMC) was used to further study the main reaction and various side reactions in the process of producing vinyl acetate from acetylene. The effects of temperature, pressure, and molar ratio of acetylene/acetic acid on the reaction process were investigated.

Experimental and theoretical insights into the cyclotrimerization of

In the actual vinyl acetate production process, benzene is a very harmful by-product for the quality of the product. In this work, the experimental method and DFT method are combined to study how the by-product benzene is produced during the production of vinyl acetate by acetylene gas-phase.

Acetylene catalytic acetylation reaction kinetics and mechanism

The material balance of the process was identified in kinetic studies with an accuracy of 3-5 percent. Based on the findings, the kinetic equation for the production of vinyl acetate from acetylene was chosen, and a hypothesised mechanism for the reaction was put forward.

Production of vinyl acetate from acetylene

The largest vinyl chloride companies are Oxy-Vinyl, Dow Chemical, Mitsubishi Chemical, Georgia Gult, which produce vinyl chloride by catalytic hydrochlorination of acetylene.

标题：Side Reactions in the Production of Vinyl Acetate from Acetylene

In modern chemical industry, acetylene (ethyne) is an important raw material for organic synthesis. It is not only used to produce a variety of chemicals such as vinyl acetate, but also widely used in the production of plastics, rubbers, coatings and adhesives. during the preparation and use of acetylene, there are some side reactions which can not only reduce the quality of products, but also bring about environmental pollution and health risks. This article will explore the main side reactions and their impacts in the process of producing vinyl acetate from acetylene.

I. Preparation of Acetylene

Acetylene is the simplest alkyne, produced by the reaction between hydrogen and chlorine at high temperatures. In laboratories, acetylene can be prepared through electrolysis or photolysis. the commonly used method in industrial production is the reduction of hydrochloric acid with iron catalyst. This method involves mixing hydrogen with hydrochloric acid, generating acetylene through the catalytic action of iron catalyst.

II. Production of Vinyl Acetate from Acetylene

Vinyl acetate is an important raw material for organic chemicals, mainly used for producing polyvinyl acetate (PVAc). In the process of producing vinyl acetate from acetylene, acetylene is first oxidized into hydrogen peroxide, which then undergoes addition reaction with acetic anhydride to form vinyl acetate. Besides, a portion of acetylene may be converted into other by-products such as methyl acetate and propionaldehyde.

III. Impacts of Side Reactions

1. Decline in Product Quality

During the preparation of acetylene, impurities such as oxygen, water vapor and hydrochloric acid may be introduced, which can affect the purity of vinyl acetate products. For instance, oxygen can react with acetylene to form peroxides, reducing the stability of the product; water vapor may cause moisture in the product, affecting its performance; hydrochloric acid might react with other components in the product, leading to a decline in product quality.

2. Environmental Pollution

The exhaust gases generated during the preparation of acetylene contain a large number of toxic and harmful substances such as chlorine, hydrochloric acid and hydrogen sulfide. These substances not only cause severe environmental pollution but also pose hazards to human health. Additionally, there are certain safety risks during storage and transportation of acetylene, such as explosions and leaks.

3. Energy Consumption

The preparation process of acetylene requires a substantial amount of electricity, especially in the hydrochloric acid reduction method carried out at high temperatures. This not only increases production costs but also exacerbates the tension of energy resources. Meanwhile, a large amount of waste heat is produced during the preparation process, which will waste a lot of energy if not effectively utilized.

IV. Coping Strategies

To reduce the side reactions in the production of vinyl acetate from acetylene, efforts can be made from several aspects:

1. Optimizing Production Process

By improving equipment and process parameters, it is possible to reduce the content of impurities in the preparation process of acetylene. For example, more efficient catalysts can be adopted, and reaction temperature and pressure can be controlled well. online monitoring and control technology can be introduced to monitor parameters in real time during the reaction process, adjusting process conditions promptly to ensure product quality.

2. Enhancing Product Recovery Rate

For by-products generated during production, such as peroxides, methyl acetate and propionaldehyde, they can be transformed into valuable products through separation and recovery. For instance, peroxides can be converted into hydrogen peroxide or sodium peroxide; methyl acetate and propionaldehyde can be used to prepare esters respectively.

3. Strongening Environmental Protection

Effective measures should be taken to reduce exhaust emissions and waste heat generation during the preparation of acetylene. For example, low-oxygen hydrochloric acid reduction method can replace the traditional high-oxygen hydrochloric acid reduction method; explosion-proof equipment and safety measures should be adopted in storage and transportation processes to ensure the safety of personnel and equipment. Additionally, new environmentally friendly materials and technologies such as biodegradable materials and clean energy can be developed to reduce environmental pollution.

4. Improving Energy Efficiency

By optimizing process flow and equipment design, energy consumption in the preparation process of acetylene can be reduced. For example, energy-efficient reactors and heat exchangers can be adopted; advanced heat and mass transfer technology can be introduced to improve heat transfer efficiency; novel highly efficient catalysts can also be developed to reduce activation energy required for reactions.

The side reactions in the production of vinyl acetate from acetylene are a complex issue involving multiple aspects such as product quality, environmental protection and energy utilization. To address these issues, comprehensive measures need to be taken from production processes, product recovery, environmental protection and energy utilization. Only by doing so can we achieve sustainable development in the production of vinyl acetate from acetylene and create more value for human society.