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Acid plants pipes

In the gas cleaning sections of spent acid or metaUurgical sulfuric acid plants, the weak acid scmbbing circuit is typicaUy handled by plastic or glass fiber reinforced plastic (ERP) pipe. The contaminants in weak acid usuaUy vary too greatly to aUow use of an economical aUoy. [Pg.188]

Gray iron is resistant to concentrated acids (nitric, sulfuric, phosphoric) as well as to some alkahne and caustic solutions. Caustic fusion pots are usually made from gray cast iron with low silicon content cast-iron valves, pumps, and piping are common in sulfuric acid plants. [Pg.2443]

Nitric acid plants Tantalum heat exchangers and sparge pipes find extensive use in plants producing high purity nitric acid, ammonium nitrate and terephthalic acid. [Pg.904]

Raw materials used by the plant include coil and sheet metal stock, solvent-based marking ink, and protective plastic end caps. The two major operations in this plant, pipe and fitting formation and acid pickling, are described in this section. [Pg.1205]

An account is given of a sequence of mishaps starting with a burst pipe in a nitric acid plant, apparently due to pre-ignition by rust catalysis of an ammonia/air mixture at 220° C and 11 bar. [Pg.1659]

The capital cost of an integrated SCR unit for a new 1,000 tonne/day plant is estimated to be 1.5% of the total capital cost of the nitric acid plant. This cost includes the cost of the SCR catalyst but excludes spare parts. The capital cost of an end-of-pipe SCR unit for an existing 1,000 tonne/day plant is estimated to be 3% to 6% of the total capital cost of the nitric acid plant. But this is very dependent on the type of nitric acid process. The SCR will increase operating costs by 1.1% when NOx in the tail gas is reduced from 1,000 ppmv to 200 ppmv. The maintenance cost of the SCR unit is typically 2.5% of the capital cost97. [Pg.237]

Postformation nitrogen oxide emission control measures include selective catalytic and noncatalytic reduction with ammonia, which between them are used by some 900 power station installations worldwide [51]. The catalytic removal methods are 70-90% efficient at NOx removal, but are more expensive to operate than the noncatalytic methods which are 30-80% efficient. Ammonia or methane noncatalytic reduction of NOx to elemental nitrogen is also an effective method which is cost-effective for high concentration sources such as nitric acid plants (Chap. 11). NOx capture in packed beds is less expensive, but this method is not particularly effective [23]. It is also not a very practical method either for utilities or for transportation sources. Two-stage scrubbing has also been proposed as an effective end-of-pipe NOx control measure. The first stage uses water alone and the second uses aqueous urea. [Pg.95]

The organic solvent is recovered for reuse in the production plant. Excess sulfuric acid mother liquor is conveyed via the internal piping system for spent acid to the existing sulfuric acid plant, where concentration, decomposition to sulfur dioxide, and oxidation to sulfur trioxide occur. Sulfur trioxide is then withdrawn and fed to the sulfonation reaction through piping. [Pg.77]

Many attempts at the lab scale were devoted to the catalytic abatement of N2O, and the technology is now available at the industrial scale even if some problems persist related to the catalyst stability at high temperature inside the ammonia burner. In the particular case of nitric acid plant, the simultaneous removal of low concentration of N2O and NO, is still of interest, since no technology is viable especially end-of-pipe systems for which the low temperatures of the exhaust gas do not allow the simultaneous conversion of N2O and NO. The implementation of a process running at medium temperatures is technologically... [Pg.626]

Acid mist captured on the candle filters drains by gravity through collection pipes to the top of the packed bed or to a collection tank external to the absorption tower. These candle drips are sometimes treated to remove nitrate compounds that form when nitrogen oxides (mainly NO(g) and N02(g)) in the acid plant feed gas react with sulfuric acid to form nitrosyl sulfuric acid (HN0S04(f) Daum, 2000 Lyne et al., 2002). High nitrogen oxide concentration feed gas is commonly found in metallurgical acid plants. [Pg.114]

The cooled, dried chlorine gas contains - 2% HCl and up to 10% O2, both of which are removed by Hquefaction. A full scale 600-t/day plant was built by Du Pont ia 1975. This iastaHatioa at Corpus Christi, Texas operates at 1.4 MPa (13.8 atm) and 120—180°C and uses tantalum-plated equipment and pipes. Oxidation of HCl Chloride by JSHtricHcid. The nitrosyl chloride [2696-92-6] route to chlorine is based on the strongly oxidi2iag properties of nitric acid... [Pg.504]

Chemical-Process Vessels. Explosion-bonded products are used in the manufacture of process equipment for the chemical, petrochemical, and petroleum industries where the corrosion resistance of an expensive metal is combined with the strength and economy of another metal. AppHcations include explosion cladding of titanium tubesheet to Monel, hot fabrication of an explosion clad to form an elbow for pipes in nuclear power plants, and explosion cladding titanium and steel for use in a vessel intended for terephthaHc acid manufacture. [Pg.150]


See other pages where Acid plants pipes is mentioned: [Pg.226]    [Pg.226]    [Pg.199]    [Pg.126]    [Pg.295]    [Pg.34]    [Pg.387]    [Pg.905]    [Pg.126]    [Pg.491]    [Pg.353]    [Pg.310]    [Pg.2710]    [Pg.2687]    [Pg.262]    [Pg.9]    [Pg.328]    [Pg.228]    [Pg.622]    [Pg.623]    [Pg.529]    [Pg.168]    [Pg.230]    [Pg.230]    [Pg.239]    [Pg.123]    [Pg.321]    [Pg.362]    [Pg.172]    [Pg.188]   
See also in sourсe #XX -- [ Pg.353 ]




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