PYROLYSIS OF THE LOWER PARAFFINS: III. PRODUCTION OF OLEFINES IN BAFFLED METAL TUBES

1933 ◽  
Vol 9 (6) ◽  
pp. 583-590 ◽  
Author(s):  
Adrien Cambron ◽  
Colin H. Bayley
Keyword(s):  
Thermal Treatment ◽  
Alloy Steel ◽  
Steel Tubes ◽  
Heat Resistant ◽  
Special Alloy Steels ◽  
Special Alloy ◽  
Alloy Steels ◽  
Elementary Carbon

Results have been obtained which indicate that the conversion of the lower paraffins to olefines by thermal treatment can be satisfactorily carried out in special alloy steel tubes at 800–820 °C. By using baffled tubes it has been found possible to obtain high rates of conversion at temperatures considerably lower than when using open tubes. Actually the temperature has been brought within the range of usefulness of special alloy steels. Heat-resistant alloys of the 18–8 type have been found unsuitable for this purpose, because nickel appears to catalyze the formation of elementary carbon, but nickel-free alloys containing over 20% of chromium have been found satisfactory.

High-Pressure Plant for Experimental Hydrogenation Processes

1934 ◽  
Vol 128 (1) ◽  
pp. 5-75 ◽  
Author(s):  
A. T. Barber ◽  
A. H. Taylor
Keyword(s):  
High Pressure ◽  
Experimental Plant ◽  
Hydrogen Attack ◽  
Special Alloy Steels ◽  
Special Alloy ◽  
Continuous Plant ◽  
Complete Disintegration ◽  
Alloy Steels ◽  
Higher Temperature ◽  
Pressure Plant

The paper gives an account of some of the mechanical difficulties experienced in the development and operation of experimental plant for the hydrogenation of coal and tar for the production of motor spirit. Particulars of the various stages of progress are given, from small autoclaves up to a continuous plant capable of producing up to 300 gallons of spirit per day. The pressure plant is operated at 3,000 to 6,000 lb. per sq. in., and at temperatures up to 950 deg. F. Hydrogen produces complete disintegration of the structure of mild steel under the higher temperature conditions. The use of special alloy steels reduces the liability to hydrogen attack, giving longer working life and allowing higher working pressures, but satisfactory service can best be obtained by insulating the pressure-resisting walls from the heating medium so as to avoid heating the metal beyond 200 deg. F. Various methods of making suitable joints for high-pressure pipes and cylinders are described, and the results of microscopic examination of sections of cylinders are given in Appendixes.

Determination of Vanadium in Special Alloy Steels

1932 ◽  
Vol 4 (2) ◽  
pp. 187-190 ◽  
Author(s):  
Hobart H. Willard ◽  
Philena Young
Keyword(s):  
Special Alloy Steels ◽  
Special Alloy ◽  
Alloy Steels

PYROLYSIS OF THE LOWER PARAFFINS: V. THE CONVERSION OF THE GASEOUS PARAFFINS TO AROMATICS IN BAFFLED METAL TUBES AND THE CHEMICAL COMPOSITION OF THE PRODUCTS

1934 ◽  
Vol 10 (2) ◽  
pp. 145-163
Author(s):  
Adrien Cambron ◽  
Colin H. Bayley
Keyword(s):  
Chemical Composition ◽  
Turbulent Flow ◽  
Alloy Steel ◽  
Nickel Alloys ◽  
Gas Flow ◽  
Thermal Conversion ◽  
Chemical Methods ◽  
Steel Tubes ◽  
Heat Resistant ◽  
Light Oil

The thermal conversion of propane to aromatics has been investigated by passing the gas through externally heated alloy steel tubes under conditions of turbulent flow. Recycling experiments carried out under pressure have shown that, when the gas flow is turbulent, high rates of conversion can be obtained at temperatures as low as 800–810 °C. Heat resistant chromium-nickel alloys of the 18:8 type have been found unsuitable for this purpose owing to the catalytic formation of carbon. Yields of 23.3 lb. of light oil per 1,000 cu. ft. of propane put through were obtained at 800 °C. together with 10 lb. of liquids boiling above 200 °C. The composition of the liquids obtained in these experiments has been determined by fractionation and chemical methods. The light oil obtained under the above conditions contains about 64% benzene, 14% toluene, 7.8% styrene and small amounts of cyclopentadiene, xylenes and higher aromatics. The liquids boiling above 200 °C. contain about 25% naphthalene and 12.5% anthracene together with smaller amounts of mono- and dimethyl naphthalenes, acenaphthene and phenanthrene.

Special alloy steels as applied to chemical engineering

1932 ◽  
Vol 51 (24) ◽  
pp. 502-520
Author(s):  
T. G. Elliot ◽  
R. J. Sarjant ◽  
W. Cullen
Keyword(s):  
Chemical Engineering ◽  
Special Alloy Steels ◽  
Special Alloy ◽  
Alloy Steels

Special alloy steels as applied to chemical engineering

1932 ◽  
Vol 51 (25) ◽  
pp. 527-531
Author(s):  
T. G. Elliot ◽  
R. J. Sarjant ◽  
W. Cullen
Keyword(s):  
Chemical Engineering ◽  
Special Alloy Steels ◽  
Special Alloy ◽  
Alloy Steels

NITRALLOY 125

Alloy Digest ◽  
1957 ◽  
Vol 6 (9) ◽  
Keyword(s):  
Fracture Toughness ◽  
Corrosion Resistance ◽  
Physical Properties ◽  
Tensile Properties ◽  
Alloy Steel ◽  
Low Temperatures ◽  
Heat Treating ◽  
Ammonia Gas ◽  
Steel Mills ◽  
Special Alloy

Abstract NITRALLOY 125 (0.20-0.30% C) is a special alloy steel which can be nitrided, that is, surface hardened, without final quenching, by the action of ammonia gas at relatively low temperatures. Nitralloy 125 is also known as Nitralloy H. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: SA-61. Producer or source: Alloy steel mills and foundries.

Sign in / Sign up

Export Citation Format

Share Document