Bisphenol A reactor acid resistant material (such as titanium alloy) selection criteria?

Acid resistant material selection standard of bisphenol A reactor

in the chemical industry, bisphenol A reactor is an important equipment for the production of bisphenol A(BPA), and the production process of bisphenol A often needs to be carried out in an acidic environment. Therefore, the material selection of the reactor is very important, especially the acid resistance. This article will analyze in detail the selection criteria for the acid-resistant material of the bisphenol A reactor to help engineers and stakeholders make better decisions.

1. Corrosion Environment Analysis and Requirements

In the production process of bisphenol A, strong acidic media such as sulfuric acid and hydrochloric acid are often involved. These acidic substances are strongly corrosive to the material of the reactor. Therefore, the choice of acid resistant material is the key to ensure the long-term stable operation of the reactor. The reaction kettle not only needs to withstand the corrosion of acidic medium, but also may face complex working conditions such as high temperature and pressure fluctuation. Therefore, the selected material needs to have excellent acid resistance, while taking into account the strength, toughness and economy.

2. acid-resistant material selection considerations

In the choice of reactor material, need to consider the following aspects:

1. Corrosion properties: the material must be able to resist the corrosion of acidic media, especially for the chemical characteristics of specific acids. For example, titanium alloy has good corrosion resistance to most inorganic acids (such as sulfuric acid and hydrochloric acid), but stress corrosion cracking may occur in high temperature concentrated sulfuric acid, so it is necessary to select the appropriate material according to the specific process conditions.

2. Physical properties: the reactor will withstand certain pressure and temperature changes during operation, so the material needs to have sufficient mechanical strength and good thermal stability. Titanium alloy with its high strength and light characteristics, become the ideal choice of bisphenol A reactor.

3. Economy: Although the cost of high-end acid-resistant materials (such as titanium alloys) is relatively high, it has a long service life, low maintenance costs, and overall has a high cost performance. For long-term operation of the equipment, the choice of good economic material is particularly important.

3. Titanium Alloy in Bisphenol A Reactor

Because of its excellent corrosion resistance and mechanical properties, titanium alloy has become the first choice for acid resistant material of bisphenol A reactor. The following are the key points for the application of titanium alloy in bisphenol A reactor:

1. Corrosion resistance: Titanium alloy has good corrosion resistance to most strong acids (such as hydrochloric acid and sulfuric acid), especially at normal temperature and medium concentration. It should be noted that under high temperature conditions, titanium alloys have poor corrosion resistance to concentrated sulfuric acid and are prone to stress corrosion cracking. Therefore, in practical applications, it is necessary to select materials reasonably according to process conditions (such as temperature, acid concentration, etc.).

2. Lightweight and high strength: the density of titanium alloy is low, only 1/4 of that of steel, and has high strength, which can effectively reduce the wall thickness of the reactor, reduce the overall weight of the equipment, and reduce the installation and operation costs.

3. Processing performance: titanium alloy processing performance is good, can meet the complex structure of the reactor manufacturing needs. The welding performance of titanium alloy is also good, which is convenient for the installation and maintenance of equipment.

4. Other Acid Resistant Materials Selection and Comparison

In addition to titanium alloy, bisphenol A reactor can also choose other acid resistant materials, such as stainless steel, hastelloy, etc. Here is a brief comparison of these materials:

1. Stainless steel: Stainless steel has good corrosion resistance in acidic media, but it is prone to corrosion under high temperature and concentrated acid conditions, and its service life is relatively short.

2. Hastelloy: Hastelloy (Hastelloy) is a nickel-based alloy with excellent corrosion resistance, especially in acidic media at high temperatures. The cost of Hastelloy is high, and the processing is difficult.

3. Carbon fiber composites: Carbon fiber composites have excellent corrosion resistance and lightweight properties, but they are prone to delamination and rupture under high temperature and high pressure conditions, so their application in bisphenol A reactors is relatively limited.

5. summary and suggestion

The acid-resistant material of the bisphenol A reactor needs to be comprehensively considered according to the specific process conditions, corrosive environment and economy. With its excellent corrosion resistance, high strength and light weight, titanium alloy has become the preferred material for bisphenol A reactor. When selecting titanium alloys, process conditions (such as temperature, acid concentration, etc.) must be fully considered to avoid equipment failure due to improper material selection. It is recommended to conduct sufficient corrosion testing and simulation analysis during the design and manufacturing process to ensure that the selected materials can meet the needs of actual working conditions.