Phenol, Acetone, Cumene - Nexant
The commercial cumene to phenol process involves two primary chemical steps, namely oxidation of cumene to cumene hydroperoxide (CHP) and acid catalyzed CHP cleavage to phenol and acetone.
the cumene process for phenol
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Mar 21, 2016 · Hock process. In the Hock process (Figure 2), cumene (1, made by alkylating benzene with propylene) is oxidized to cumene hydroperoxide (2), which is then cleaved to a mixture of phenol (3) and acetone (4) by treating it with H 2 SO 4.The good news is that for every 10 kg of phenol produced, 6.2 kg of acetone is coproduced.
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The cumene process (cumene-phenol process, Hock process) is an industrial process for synthesizing phenol and acetone from benzene and propylene. The term stems from cumene (isopropyl benzene), the intermediate material during the process.
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Phenol is an important chemical intermediate, which is mostly consumed in the production of phenolic resins and polycarbonates via bisphenol A. The production economics of phenol are closely interlinked with cumene, which is the primary feedstock and with acetone, which is the primary coproduct.
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A process for oxidatively preparing phenol and acetone from cumene including the steps of a. cleaving cumene hydroperoxide to produce a mixture comprising phenol.
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As stated previously, the conversion of cumene to phenol and acetone is a well known process utilizing individual process steps well known in the industry. The formation of the cumene hydroperoxide by the air oxidation of cumene is performed under standard conditions and the cumene hydroperoxide brought to a higher concentration by stripping unreacted cumene.
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economic feasibility of developing a new cumene production process an existing plant site for the synthesis and purification of cumene with an output goal of 100,000 metric tons per year for a plant life of 15 years. Cumene in the global petrochemical industry is used primarily as a reactant for production of phenol.
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The cumene process (Scheme 1), developed by Hock and Lang, 24 is by far the most important synthetic process 19, 20 for the production of phenol, and accounts for more than 95% of the synthetic phenol capacity in the Western world today. In addition to the cumene synthesis process, about 3% of phenol is derived from coal.
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The main process for manufacturing cumene involves the reaction of propylene and benzene in the presence of phosphoric acid-based catalysts or, more recently, zeolite catalysts. The cumene is oxidised in the liquid phase to cumene hydroperoxide which is then cleaved in the presence of sulphuric acid to phenol and acetone.
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The cumene process for phenol–acetone (PA) manufacture is one of the unique high-volume petrochemical processes in which simultaneously two products (phenol and acetone) are obtained from one reactant (cumene), each of the products finding useful application; however, which is most important, their reaction with one another in the joint synthesis results in bisphenol, a chemical that forms the .
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Click to view on Bing7:34Aug 16, 2016 · Preparation of Phenol from cumene ( Cumene process) - Duration: 8:56. Anand Rai 1,495 views
- Author: Any Time Padhai Academy
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The so oxidized process stream is sent into a pressure relief vessel and thereafter to a couple of columns where cumene in excess evaporates under conditions of vacuum and temperature to concentrate the CHP up to 80%; vapor of cumene is then condensed and sent to the caustic washing system to later be reincorporated to the oxidation process.
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Benzene and propylene, the two reactants used to create cumene, are produced primarily as a byproduct of crude oil refining. On the downstream side of cumene production, phenol is used to produce important chemicals including bisphenol-A (BPA), polycarbonate resin, and phenolic resins.
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Get PriceMaterial Balances Design Problem Cumene Production .
propylene cumene diisopropyl benzene (DIPB) The best technology for cumene production is a catalytic process that is optimized at 350 °C and 25 atm. pressure. The benzene is kept in excess to limit the amount of DIPB product. Process Description The reactants are .
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6 Alkylation of Benzene by Propylene to Cumene
192 6 Alkylation of Benzene by Propylene to Cumene. energy requirements are now Q h = 5330 kW and Q c = 8005 kW, much lower than before. But the salient element is that an amount of 2000 kW can be exported as process steam with a pressure of about 5 bar, as indicated by Figure 6.12 (right - hand).
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The cumene process (cumene-phenol process, Hock process) is an industrial process for developing phenol and acetone from benzene and propylene. The term stems from cumene (isopropyl benzene), the intermediate material during the process.
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Aug 15, 2016 · The given concept is explained with examples in Hinglish by IITian Faculty from Kota.
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Get PriceEngineers Guide: Cumene Peroxidation Process for Phenol ...
The cumene peroxidation process for the manufacture of phenol involves the liquid phase air oxidation of cumene to cumene peroxide, which in turn is decomposed to phenol .
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The decomposition of cumene hydroperoxide to phenol and acetone is the most commercially important process for producing phenol. It is known that the above process gives rise to a number of byproducts especially alpha methyl styrene ansd derivatives thereof particularly dimers of alpha methyl styrene, cumyl phenol and tarry polymeric materials.
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Mar 11, 2019 · This is an old industrial process. Cumene (isopropylbenzene) is oxidized with air in the presence of a cobalt catalyst. The product is cumene hydroperoxide, which is to say PhCMe2OOH. When the hydroperoxide is heated in dilute sulfuric acid, it fragments into phenol and .
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The cumene process (cumene-phenol process, Hock process) is an industrial process for synthesizing phenol and acetone from benzene and propylene. Hydroquinone, also known as benzene-1,4-diol, is prepared by dialkylation of benzene with propene to give 1,4-diisopropylbenzene.
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Nov 23, 2009 · The chemistry of the cumene process features the desired reaction of benzene with propylene to form cumene and the undesirable reaction of cumene with propylene to form p-diisopropylbenzene. Both reactions are irreversible. Since the second has a higher activation energy than the first, low reactor temperatures improve selectivity of cumene.
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THE first plant to produce phenol and acetone from petroleum, through oxidation of cumene, went into operation last week when B. A.-Shawinigan Ltd. officially opened its plant at Montreal. The company, owned jointly by Shawinigan Chemicals and British American Oil Co., Ltd., is operating under license from Hercules Powder and Distillers Co., Ltd.
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The present invention provides in a particular embodiment an improvement in the process for producing phenol by the acid-catalyzed cleavage of cumene hydroperoxide (CHP). The reactant stream fed to the cleavage reactor also includes the contaminant by-product dimethyl benzyl alcohol (DMBA) formed during the direct oxidation of cumene to CHP.
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Phenol is an important chemical intermediate, which is mostly consumed in the production of phenolic resins and polycarbonates via bisphenol A. The production economics of phenol are closely interlinked with cumene, which is the primary feedstock and with acetone, which is the primary coproduct.
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Get PriceSource Assessment: Manufacture of Acetone and Phenol From ...
The 1980 projected production of phenol from cumene is 1,100 x 103 metric tons. Thus, assuming the same level of control 1980 exists in 1980 as existed in 1975, emissions from the manufacture of acetone and phenol from cumene will increase by 56% over that period; i.e., Emissions in 1980 _ 1,100 x 103 _, -,.
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OXIDATION / CONCENTRATION. The raw material for this section is Cumene which is oxidized using compressed air. Cumene is previously washed with a caustic solution to remove impurities that can affect the oxidation. Air may be eventually washed to mainly neutralize SO2 traces coming out of the Sulfuric Acid Plant stack.
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Get PriceCumene process - Wikipedia Republished // WIKI 2
The cumene process (cumene-phenol process, Hock process) is an industrial process for developing phenol and acetone from benzene and propylene.The term stems from cumene (isopropyl benzene), the intermediate material during the process. It was invented by Heinrich Hock in 1944 and independently by R. Ūdris and P. Sergeyev in 1942 (USSR).. This process converts two relatively cheap starting ...
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Acute Effects. Cumene is a skin and eye irritant in humans and animals. (-) Tests involving acute exposure of rats, mice, and rabbits, have demonstrated cumene to have moderate acute toxicity by inhalation or dermal exposure and low to moderate acute toxicity by ingestion.
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