CDTECH

A two-phase process developed by CDTech in the 1980s (22,23) and Hcensed also by ABB Lummus Crest is claimed to be appHcable to dilute... 

Methyl tert-Butyl Ether (MTBE). Methyl tert-hutyi ether [1634-04-4] is made by the etherification of isobutylane with methanol, and there are six commercially proven technologies available. These technologies have been developed by Arco, IFF, CDTECH, Phillips, Snamprogetti, and Hbls (hcensed jointly with UOP). The catalyst in all cases is an acidic ion-exchange resin. The United States has been showing considerable interest in this product. Western Europe has been manufacturing it since 1973 (ANIC in Italy and Huls in Germany). Production of MTBE in Western Europe exceeded 600,000 tons in 1990. 

In the CDTECH process (formerly CR L technology), the first reactor is adiabatic. The heat of reaction is removed pardy by vaporization of the reaction mix. The operating temperature is controlled by adjusting the operating pressure. 

The reactor combinations for the two reactors in series consist of two fixed-beds for the Arco process an expanded bed followed by a catalytic distillation reactor for lEP a fixed-bed followed by a catalytic distillation reactor for CDTECH and two fixed-beds for Phillips. The Huls process uses an adiabatic reactor for the second reactor. 

CD-Cumene A process for making cumene for subsequent conversion to phenol and acetone. The cumene is made by catalytic alkylation of benzene with propylene in a catalytic distillation reactor. Developed in 1995 by CDTech. 

CDHydro [Catalytic distillation hydrogenation] A process for hydrogenating diolefins in butylene feedstocks. It combines hydrogenation with fractional distillation. Developed by CDTECH, a partnership between Chemical Research Licensing Company and ABB Lummus Crest. The first plant was built at Shell s Norco, LA, site in 1994. Ten units were operating in 1997. 

Should MTBE be banned, what would be the logical replacement(s) There are several options available. Several refiners opted to build MTBE capacity and avoid purchasing the ether on the open market. MTBE units were an option to use the facility s isobutylenes. Several licensed processes can be used to convert existing MTBE units. Kvaerner and Lyondell Chemical Co. offer technologies to convert an MTBE unit to produce iso-octane, as shown in Fig. 18.27.12 Snamprogetti SpA and CDTECH also have an iso-octene/iso-octane process. These processes can use various feedstocks such as pure iso-butane, steam-cracked C4 raffinate, 50/50 iso-butane/iso-butene feeds, and FCC butane-butane streams. The process selectively dimerizes C4 olefins to iso-octene and then hydrogenates the iso-octene (di-iso-butene) into iso-octane. The processes were developed to provide an alternative to MTBE. The dimerization reactor uses a catalyst similar to that for MTBE processes thus, the MTBE reactor can easily be converted to... 

Over the past seven years, cumene producers have begun to convert to the more environmentally friendly and more efficient zeolite-based processes. Principal among these are processes licensed by Dow, CDTech, Mobil-Badger, Enichem, and UOP. The zeolite based processes produce higher cumene yields than the conventional SPA process because most of the diisopropylbenzene byproduct is converted to cumene in separate transalkylation processes. Operating and maintenance costs are reduced because there is no corrosion associated with the zeolite catalysts. Finally, environmental concerns associated with the disposal of... 

Licensor CDTECH, a partnership between ABB Lummus Global and Chemical Research Licensing. 

Application Advanced technology to produce high-purity ethylbenzene (EB) alkylating benzene with ethylene using patented catalytic distillation (CD) technology. The CDTECH EB process uses a specially formulated zeolite alkylation catalyst packaged in a proprietary CD structure. The process is able to handle a wide range in ethylene feed composition—from 10% to 100% ethylene. 

Catstill [Catalytic Distillation] A catalytic distillation process for making high-octane gasoline from off-gases from a catalytic cracker. It can also be used for making a mixture of benzene, toluene, and xylenes from the off-gases from a steam reformer. A demonstration plant was operated at a refinery in the midwestern United States in 1988 to 1989. Developed and offered for license by Chemical Research and Licensing Company, Houston, TX, now CDTech. 

CD [Catalytic Distillation] A range of petrochemical processes based on "catalytic distillation, developed and offered by Catalytic Distillation Technologies (CDTech). They include CDAlky, CDElbe, CDEtherol, CDEthers, CDIB, CDIsotame, CDMtbe. 

CDTECH Butadiene C4+ from naphtha cracking Selective hydrogenation of C4 acetylenes in a distillation column to produce low acetylene feed for butadiene extraction 2 1998... 

CDTECH Isobutylene Raffinate 1 Selective hydrogenation of butadiene and hydroisomerization of butene-1 to butene-2 via catalytic distilation to recover isobutylene 1 1994... 

CDTECH/Snamprogetti SpA Isobutylene Mixed C4 hydrocarbons Integrated MTBE and MTBE backcracking processes to selectively recover high-purity (99.9%) isobutylene 7 1991... 

CDTECH Isobutylene/isoamylene n-Butenesand n-pentenes Skeletal isomerization of n-olefins to iso-olefins 3 2000... 

CDTECH/Snamprogetti SpA Isooctene/isooctane Mixed C4 hydrocarbons Isobutylene diemrization to produce isooctene. Additional process can hydrogenate isooctene to produce isooctane 2 1999... 

CDTECH n-Butenes Mixed C4 hydrocarbons Selective hydogenation of butadiene to n-butenes in catalytic distillation column 4 1997... 

CDTECH Propylene C3 + steam cracker Selective hydrogenation of methyl acetylene and propadiene to propylene 3 1999... 

CDTECH Cumene Crude cumene Selective hydrogenation of alpha methyl styrene in a distillation column to produce purified cumene distillate NA NA... 

CDTECH Cumene Propylene and benzene Catalytic distillation technology with zeolite catalyst, high yield/ quality produce ultra-high purity 1 1995... 

CDTECH Ethylbenzene Benzene, ethylene Patented fix-bed, catalytic distillation technology uses zeolite catalyst to alkylate benzene with ethylene NA NA... 

CDTECH/Mobil DIPE Refinery C3 stream Ether production from propylene and water using Zeolite catalyst NA NA... 

CDTECH/Snamprogetti SpA ETBE Mixed C4 hydrocarbons High-conversion catalytic distillation process for ETBE using C4s and ethanol 5 2000... 

CDTECH, Inc. Ether Refinery C4 and C5 streams Produces high iso-olefin/ether products by hydrogenation and isomerization 5 1992... 

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