Wet oxidation treatment of waste alkali

It is better to use lined steel pipes or non-metallic pipes.

Do you have any production experience in actual installations? Some domestic factories use ultra-low carbon austenitic stainless steel~

Ultra-pure ferritic stainless steel 000Cr30Mo1 can be used; under these operating conditions, its corrosion resistance is superior to that of pure nickel

Ultra-pure ferritic stainless steel 000Cr30Mo1 can be used; under these operating conditions, its corrosion resistance is superior to that of pure nickel

Can nickel-based alloys also meet the operating conditions? Looking at the performance curve of carbon steel in NaOH solution, is it recommended to use nickel-based alloys when the temperature exceeds 110 degrees?

It refers to the waste alkali remaining from the desulfurization of liquefied gas and the deodorization of gasoline in refineries; its composition is quite complex, and the temperature resulting from oxidation treatment in the reactor is 190 degrees.

The pressure is approximately 30 kilograms, which falls within the range of medium-pressure wet oxidation treatment processes

1. In terms of performance: 000cr30Mo1 is a super-pure ferritic stainless steel, which is different from carbon steel. At 140 degrees in 50% NaOH, this steel grade has a corrosion rate of less than 0.025 mm/year; it is not prone to SCC, and it resists chlorides, sulfides, and various other impurities. The corrosion rate of pure nickel at this temperature is less than 0.003 mm/year, but when it contains impurities such as chlorides and sulfides, its corrosion resistance is inferior to that of ultra-pure ferritic stainless steel. There are many types of nickel-based alloys, but in relatively \"pure\" NaOH, their corrosion resistance is inferior to that of pure nickel. In 150-degree, 50% alkaline solutions, the corrosion rate for Hastelloy C series is 0.45 mm per year or more, while that for Alloy 625 is around 0.06 mm per year; both of these alloys also tend to develop SCC. It’s not used very often in practice. Since your operating conditions will certainly involve sulfides, using ultra-pure ferritic stainless steel is more suitable than most nickel-based alloys. 2. From a cost perspective: 000Cr30Mo1 contains no nickel, so its cost is relatively lower compared to nickel-based alloys. Good value for money. In short, ultra-pure ferritic stainless steel is recommended.

1. In terms of performance: 000cr30Mo1 is a super-pure ferritic stainless steel, which is different from carbon steel. At 140 degrees in 50% NaOH, this steel grade has a corrosion rate of less than 0.025 mm/year; it is not prone to SCC, and it resists chlorides, sulfides, and various other impurities. The corrosion rate of pure nickel at this temperature is less than 0.003 mm/year, but when it contains impurities such as chlorides and sulfides, its corrosion resistance is inferior to that of ultra-pure ferritic stainless steel. There are many types of nickel-based alloys, but in relatively \"pure\" NaOH, their corrosion resistance is inferior to that of pure nickel. In 150-degree, 50% alkaline solutions, the corrosion rate for Hastelloy C series is 0.45 mm per year or more, while that for Alloy 625 is around 0.06 mm per year; both of these alloys also tend to develop SCC. It’s not used very often in practice. Since your operating conditions will certainly involve sulfides, using ultra-pure ferritic stainless steel is more suitable than most nickel-based alloys. 2. From a cost perspective: 000Cr30Mo1 contains no nickel, so its cost is relatively lower compared to nickel-based alloys. Good value for money. In short, ultra-pure ferritic stainless steel is recommended.

Uh, thank you. Are there any books or materials on this topic that I can use to learn* about it?