Titanium’s applications in chemical industry

Dec. 28, 2011 - PRLog -- Titanium has excellent corrosion resistance, mechanical properties and process performance, are widely used in many sectors of the national economy.

Especially in the chemical production, use of titanium instead of stainless steel, nickel-based alloys and other metals as corrosion-resistant materials, which has great significance in increasing production, product quality, extending equipment life, reducing consumption, energy consumption, costs, preventing pollution and improving working conditions and increase productivity and other aspects.

In recent years, China's chemical use in titanium keep expanding, the amount increases every year, titanium has become the main anti-corrosion material in chemical equipment. Titanium as corrosion-resistant chemical equipment in the structural material, has established its position, but also as an ideal material for chemical equipment, titanium, lead engineers and technicians and more and more attention.

1.   The chlor-alkali industrial

chlor-alkali industry is an important basic raw material industry, its production and development has a great impact on the national economy. This is because the chloride corrosion resistance of titanium is better than that of stainless steel and other non-ferrous metals. Now titanium is widely used in chlor-alkali industry to produce titanium metal anodes, ion-exchange membrane electrolyzer, wet chlorine cooler, refined brine preheater, dechlorination towers, chlorine scrubbers and other cooling.

The main components of these devices usually use more non-metallic materials (such as graphite, PVC, etc.) in the past, due to the mechanical properties, thermal stability and processing performance of non-metallic materials is not satisfactory, resulting in heavy equipment, energy consumption, short life and affect product quality and pollution of the environment. Therefore, since the 1970s, China began to use Metal anodes electrolyzer and Ionic membrane electrolyzer to replace Graphite electrolyzer, use Titanium wet chlorine cooler to replace graphite cooler, achieved good results. For example: titanium wet chlorine cooler applications. Salt electrolytic production of caustic soda to produce large amounts of hot wet chlorine gas, the temperature is generally 75 ~ 95 ℃, need cooling and drying to go through to use.

Our salt electrolysis production of chlorine, because of the cooling process unreasonable or cooling equipment corrosion problems due to impact of the chlorine production and quality, but also seriously pollutes the environment. High-temperature corrosion of titanium wet chlorine cooler production, changing the chlor-alkali industry in the preparation of chlorine production outlook. Titanium in high-temperature environment in a very wet chlorine corrosion resistance, titanium at room temperature when the chlorine, the corrosion rate of 0.000565mm / a; at 80 ℃ of the chlorine in the corrosion rate of titanium 0.00431mm / a; containing 95% wet chlorine gas, the corrosion rate of titanium at room temperature for the 0.00096mm / a. Many titanium chlor-alkali plants using wet chlorine cooler, and some have been used for nearly 20 years, is still intact.

2. Soda ash industry

Soda ash is one of the most basic chemical raw materials, it is directly related to the national economy. Soda ash production process, the gas medium, mostly NH3 and CO2, liquid media, mostly NaCl, NH4Cl, NH4HCO3, and higher concentrations of Cl-solution, using carbon steel, cast iron material for carbonation reaction of carbonation tower tubes, hot mother liquor cooler, cold crystallization, etc. outside the main equipment, are intolerant of corrosion, corrosion leaks seriously, life is not more than three years. 1975-1977, Tianjin Soda Plant and Dalian Chemical Industry Company applied plant for the demonstration of titanium, carbon tower cooling Φ63 × 2mm, titanium plate heat exchanger, cooler outside titanium, titanium pump, CO2 turbine compressor rotor, Ti-6Al-4V alloy impeller applications such good effect that the use of titanium for the whole industry transformation and three new 600,000 tons of soda ash plant has played a model role. For example: the top of a soda ash plant distillation column application of ammonia condenser tube instead of titanium cast iron pipe. Ammonia condenser is the device in soda ash production process, the distillation column for ammonia condensing steam out of, which consists of two cast iron cooling boxes, each box of diameter 2.5m, high 1.2m, original box with Φ63 × 6 × 2986mm cast iron tubes 214, two boxes of 428. Both inside and outside tubes with thermosetting phenolic varnish corrosion, tube medium for NH3, CO2, H2O vapor, the temperature around 95 ℃. Go NH4Cl liquor tube, and tube heat exchanger medium. Under these conditions, severe corrosion of cast iron pipe, use the year that is part of the perforated pipe corrosion, corrosion of 2 years has been seriously damaged, stop using it. To solve the ammonia condenser serious corrosion problems within the cast iron pipe, cast iron pipe will replace all TA2 titanium tubes, specifications for the Φ60 × 2 × 3010mm, titanium pipe between the end plate and cast iron flowers with rubber O-ring seal. This is the first of China's soda ash industry distillation tower cooling tubes used titanium tube. More than two years of operation, the macro has been pumping tube inspection, corrosion was not found, expected to last more than 20 years, comparable cast iron pipe extended 10 times.

As the corrosion resistance of titanium tube, good heat transfer efficiency (cast iron pipe in a three-year overhaul period, the heat transfer efficiency is good early, medium poor, the late failure), NH4Cl liquor preheating tube heat recovery to improve the mother liquor into the distillation column temperature, can save a lot of steam, economic performance obvious.
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