High Pressure Synthesis of Delta-Valerolactone and Adipic Acid

Bhattacharyya, Souvik; Nandi, Dilip K.

doi:10.1021/ie50590a034

Cited by 5 publications

(1 citation statement)

References 2 publications

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“…18 Lactide can be easily derived from corn starch and d-valerolactone has been obtained as a byproduct of the synthesis of adipic acid from tetrahydrofuran (THF). 19 Characteristics such as the glass transition temperature, crystallinity and the morphology of the homopolymers can be tailored using the copolymerization technique. The monomer ratio in the synthesized copolymer may efficiently control the degradation rate of the copolymer.…”

Section: Introductionmentioning

confidence: 99%

Nanolamellar triblock of poly-d,l-lactide–δ-valerolactone–d,l-lactide with tuneable glass transition temperature and crystallinity for use as a drug-delivery vesicle

Kasyapi

Bhowmick

2014

RSC Adv.

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Section: Introductionmentioning

confidence: 99%

Nanolamellar triblock of poly-d,l-lactide–δ-valerolactone–d,l-lactide with tuneable glass transition temperature and crystallinity for use as a drug-delivery vesicle

Kasyapi

Bhowmick

2014

RSC Adv.

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Catalytic synthesis of ethyl propionate from diethyl ether and carbon monoxide at high pressure

Bhattacharyya

Palit

1962

J. Appl. Chem.

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Thc catalytic synthesis of ethyl propionate from diethyl ether and carbon monoxide has been sttidicd in the presence of nickel, cobalt and iron catalysts a t a pressure range of 175-375 atm., and temperature range of 200-300".Of the various catalysts tested, the iodides of iron, cobalt and nickel. supported on silica gel, exhibit the maximum catalytic activity. Reduced metals and their carbonyls arc practically inactive. Under the optimum conditions (230"/240 atin.) the maximum yields of ethyl propionate and propionic acid were 28.2 and lO.!O/, respectively. The possible reactions leading to the formation of by-products have been elucidated hv decomposition studies. IntroductionOrganic esters find extensive uses in various fields of industry. They can be synthesised by various methods, and that involving esterification of acids with alcohols is the one mostly employed in commercial practice. This process, however, has some drawbacks, e.g., (i) a large alcohol-to-acid ratio is required for appreciable yield of ester and (ii) there is difficulty in obtaining the higher acids in the pure state. As a result, new methods for the production of esters are being explored.Attempts to synthesise esters from ethers and carbon monoxide in the presence of various acid-type Catalysts have been made by various workers, but the results are covered by and include the formation of acids, acid anhydrides, etc., as by-products. The advantages of such processes over the widely used acid esterification method lie in (i) the valuable by-products which can be obtained and (ii) the independence of the process on the availability of particular acids in the purest possible state for the manufacture of the respective esters.As a result of their extensive work on the synthesis of various organic acids, esters, ethers, etc., from carbon monoxide as one of the raw materials under high pressure, Bhattacharyya et ~l.,~-lO have established that iron, nickel and cobalt catalysts, particularly the halides, exhibit the maximum catalytic activity. This has also been found in the present investigation, and hence detailed study has been made of the effects of different working variables on the yield of the ester with the above-mentioned catalysts.

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Catalytic synthesis of ethyl propionate from ethylene, carbon monoxide and ethanol at high pressure

Bhattacharyya

Nag

1962

J. Appl. Chem.

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A comprehensive study has been made of the high‐pressure synthesis of ethyl propionate from ethylene, carbon monoxide and ethanol in the presence of iron, cobalt and nickel catalysts at 2000–8200 p.s.i. and 180–300°. Reduced iron, cobalt and nickel and their carbonyls have practically no catalytic effect, but their halides exhibit excellent catalytic activity. The relative catalytic activities of the halides are in the order: iodides > bromides > chlorides. The activities of the metals are in the order: cobalt > nickel > iron. Under the most favourable conditions (catalyst–metal/silica 50: 50; at 230° 6000 p.s.i. with cobalt and nickel iodide catalysts, and 4400 p.s.i. with ferrous iodide catalyst; residence time 2 h.), the process yields of ethyl propionate based on ethanol input are 57.0, 45.1 and 43.4% with cobalt, nickel and iron iodide catalysts, respectively.

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High Pressure Synthesis of Delta-Valerolactone and Adipic Acid

Cited by 5 publications

References 2 publications

Nanolamellar triblock of poly-d,l-lactide–δ-valerolactone–d,l-lactide with tuneable glass transition temperature and crystallinity for use as a drug-delivery vesicle

Nanolamellar triblock of poly-d,l-lactide–δ-valerolactone–d,l-lactide with tuneable glass transition temperature and crystallinity for use as a drug-delivery vesicle

Catalytic synthesis of ethyl propionate from diethyl ether and carbon monoxide at high pressure

Catalytic synthesis of ethyl propionate from ethylene, carbon monoxide and ethanol at high pressure

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