Yes
Butyl rubber is a synthetic rubber, a copolymer of isobutylene with isoprene. The abbreviation IIR stands for isobutylene isoprene rubber. Polyisobutylene, also known as PIB or polyisobutene, (C 4 H 8) n, is the homopolymer of isobutylene, or 2-methyl-1-propene, on which butyl rubber is based. Butyl rubber is produced by polymerization of about 98% of isobutylene with about 2% of isoprene. It can be made from the monomer isobutylene or CH 2 =C(CH 3) 2 only via cationic addition polymerization. A synthetic rubber, or elastomer, butyl rubber is impermeable to air and used in many applications requiring an airtight rubber. The reaction product stream, comprising diisobutylene, isobutylene, TBA, and water, is purified by a process a shown in. . The reaction product stream is passed via line 2 to a single distillation tower with a side draw (distillation tower 1). The reaction product stream, comprising diisobutylene, isobutylene, TBA, and water, is purified by a process a shown in. . The reaction product stream is passed via line 11 to a first distillation tower 10. Tower 10 contains 35 ideal stages, 11 above feed and 24 below feed. Isobutylene is used as an intermediate in the production of a variety of products. It is reacted with methanol and ethanol in the manufacture of the gasoline oxygenates methyl tert-butyl ether (MTBE) and ethyl tert-butyl ether (ETBE), respectively. Alkylation with butane produces isooctane, another fuel additive. Isobutylene is also used in the production of methacrolein. Polymerization of isobutylene produces butyl rubber (polyisobutylene). Antioxidants such as butylated hydroxytoluene (BHT) and butylated hydroxyanisole (BHA) are produced by Friedel-Crafts alkylation of phenols using isobutylene Water is separated from the first overhead stream, and the resulting isobutylene-enriched stream is recycled back to the reaction step. The first bottoms stream is distilled to produce a bottoms product stream comprising diisobutylene and a second overhead stream comprising tertiary butyl alcohol and diisobutylene. The reaction product stream, comprising diisobutylene, isobutylene, TBA, and water, is purified by a process a shown in. . The reaction product stream is passed via line 11 to a first distillation tower 10. Tower 10 contains 35 ideal stages, 11 above feed and 24 below feed. This invention is a process for producing diisobutylene from isobutylene. The process comprises first contacting a sulfonic acid resin with a reaction feed comprising isobutylene and tertiary butyl alcohol to produce a product stream comprising diisobutylene, isobutylene, tertiary butyl alcohol, and water. This example shows that the use of a single distillation tower with a side draw is ineffective for removing water from the TBA recycle stream (line 4), or from the isobutylene recycle stream (line 5). Abstract. This invention is a process for producing diisobutylene from isobutylene. The process comprises first contacting a sulfonic acid resin with a reaction feed comprising isobutylene and tertiary butyl alcohol to produce a product stream comprising diisobutylene, isobutylene, tertiary butyl alcohol, and water. The reaction product stream, comprising diisobutylene, isobutylene, TBA, and water, is purified by a process a shown in. . The reaction product stream is passed via line 11 to a first distillation tower 10. Tower 10 contains 35 ideal stages, 11 above feed and 24 below feed. The flow rates of the components of the various streams (in pounds per hour) are shown in Table 1. This example shows that the use of a single distillation tower with a side draw is ineffective for removing water from the TBA recycle stream (line 4), or from the isobutylene recycle stream (line 5). The reaction product stream, comprising diisobutylene, isobutylene, TBA, and water, is purified by a process a shown in. . The reaction product stream is passed via line 11 to a first distillation tower 10. Tower 10 contains 35 ideal stages, 11 above feed and 24 below feed. The product stream is distilled to produce a first overhead stream comprising water and isobutylene and a first bottoms stream comprising diisobutylene and tertiary butyl alcohol. Water is separated from the first overhead stream, and the resulting isobutylene-enriched stream is recycled back to the reaction step. The first bottoms stream is distilled to produce a bottoms product stream comprising diisobutylene and a second overhead stream comprising tertiary butyl alcohol and diisobutylene. This example shows that the use of a single distillation tower with a side draw is ineffective for removing water from the TBA recycle stream (line 4), or from the isobutylene recycle stream (line 5). Loss of the isobutylene which is recycled must be minimized. In the present invention, the dehydrogenation process is operated so as to limit the isomerization of isobutane or isobutylene to their corresponding straight-chain (i.e., normal) form. If the feed stream is substantially pure isobutane (i.e., it contains no isobutylene) it has been determined that, when using a Pt-Nd on zinc aluminate catalyst, a selectivity of 95% or more to isobutylene can be obtained with a residence time of about 5 seconds at a temperature of about 510° C. or lower. Isobutylene (or 2-methylpropene) is a hydrocarbon of industrial significance. It is a four-carbon branched alkene (olefin), one of the four isomers of butylene. At standard temperature and pressure it is a colorless flammable gas. It is reacted with methanol and ethanol in the manufacture of the gasoline oxygenates methyl tert-butyl ether (MTBE) and ethyl tert-butyl ether (ETBE), respectively. Alkylation with butane produces isooctane, another fuel additive. Isobutylene is also used in the production of methacrolein.
https://en.wikipedia.org/wiki/Butyl_rubber http://www.google.com/patents/US8067655 https://en.wikipedia.org/wiki/Isobutylene http://www.google.com/patents/US8067655 http://www.freepatentsonline.com/8067655.html http://www.google.com/patents/US8067655 http://www.google.com/patents/US8067655 http://www.freepatentsonline.com/8067655.html http://www.google.com/patents/US4766266 https://en.wikipedia.org/wiki/Isobutylene
is isobutylene recyclable