Acetylene generation

There are two classes of acetylene generators the low pressure generator which operates below 108.2 kPa (15.7 psi), and the medium pressure generator which operates between 108.2 and 204.7 kPa (29.7 psi). The latter is more prevalent in the United States. 

Acetylene from calcium carbide can be advantageous in that calcium carbide may be shipped to the point of acetylene usage and acetylene generated on the spot. This avoids the necessity for low pressure, low pressure-drop gaseous acetylene pipelines, or high pressure cylinders for shipping acetylene. 

Although acetylene is considered to be a material having a very low toxicity, a threshold limit value (TLV) of 2500 ppm has been estabUshed by NIOSH. In the presence of a small amount of water carbide may become incandescent and ignition of the evolved air—acetylene mixture may occur. Nonsparking tools should be used when working in the area of acetylene-generating equipment. 

Azetylen, n. acetylene, -entwickler, m. acetylene generator. azetyUeren, v.t. acetylate. 

Water system design, 20 757-760 applications of, 20 764 Water systems, high purity, 77 807-808 Water-to-carbide acetylene generators, 7 207... 

Butanediol is commercially produced by several different processes [7], The most prevalent process for making BDO is known as the Reppe process. This process uses acetylene, generated from natural gas, as its primary feedstock, according to the following ... 

Acetylene is a tricky chemical feedstock. It is extremely reactive (and explosive) and impractical to transport. Generally, the industrial processes that use acetylene are close to the acetylene-generating source. Despite all the drawbacks, the Reppe process was for a half century the preferred process for EDO, but now the growth in EDO is being taken by the propylene oxide (PO) and butane feedstock routes. 

Two precedent examples had been reported of the enantioselective [2+2+2] cycloaddition of alkynes. In one case, an enantioposition-selective intermolecular reaction of a triyne with acetylene generated an asymmetric carbon at the benzylic position of a formed benzene ring [19]. In the other case, an intramolecular reaction of a triyne induced helical chirality [20]. Both reactions were developed by chiral Ni catalysts. 

Acetylene generator Lime-soda process Paper industry... 

Proximate Analysis.—Moisture and residual solvent, in the case of nitro-glycerine explosives, are determined by Marshall s modification of L. W. Dupre s method (L. W. Dupre, Chemiker Zeitung, 540, 1901, and Marshall, Journ. Soc. Chem. Ind., 154, 1904). P. V. Dupri (Analyst, I9°6> 31, 2I3) estimates water in the volatile matter by passing it through a layer of calcium carbide and measuring the acetylene generated. 

A series of experiments to separate the complex reactions of acetylene generation and acetylene preservation occurring during the arc pyrolysis... 

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