Methyl isobutyl ketone

About: Methyl isobutyl ketone is a research topic. Over the lifetime, 2071 publications have been published within this topic receiving 26976 citations. The topic is also known as: Hexone & Isobutyl methyl ketone.

Distillation process for recovering anhydrous hydrogen fluoride

Abstract: 1,054,745. Hydrogen fluoride. HALCON INTERNATIONAL Inc. Feb. 13, 1964 [Feb. 13, 1963], No. 6067/64. Heading C1A. Anhydrous hydrogen fluoride is recovered by forming a two-phase mixture by contacting aqueous hydrogen fluoride with an immiscible, oxygenated, organic liquid, and distilling hydrogen fluoride from the organic liquid phase. Water may be removed from the aqueous phase to reform the azeotrope which is recycled to the contact step. The organic liquid may he cyclohexanol, methyl isobutyl ketone, methyl isopropyl ketone, n-butanol and nhexanol. Mixing with cyclohexanol may be achieved in a simple mixer, or in a multi-stage reaction column; or vapours containing hydrogen fluoride, water, and cyclohexanol may be mixed and condensed; or a liquid cyclohexanol stream may be contacted with an aqueous, hydrogen fluoride vapour. A dilute, aqueous, hydrofluoric acid mixture is passed via line 10 into column 12 where distillation is carried out at atmospheric pressure to yield an azeotrope containing 38% hydrogen fluoride, and an overhead containing water which is taken out via line 13 and may be further distilled to recover any cyclohexanol. The azeotrope from column 12 is passed via line 14 to liquid-liquid contactor/separator 17 together with recycled cyclohexanol from line 16 amounting to 5A6 times the weight of hydrogen fluoride in the azeotrope fed. Two liquid phases are formed. The cyclohexanol phase, containing 75% cyclohexanol, 12% hydrogen fluoride and 13% water, is passed to hydrogen fluoride column 19, where a hydrogen fluoride stream is taken overhead and passed to optional final drying column 21, wherein dry hydrogen fluoride is separated as an overheat at 22 and the bottom fraction being the aqueous azeotrope is recycled to the contactor 17 via lines 15, 14. The bottoms from column 19 is predominantly cyclohexanol and it is recycled to the contactor 17 via line 16. The aqueous phase from the contactor/separator 17, containing 74% water, 23% hydrogen fluoride and 3% cyclohexanol, is recycled to column 12. In a modification of the above process, Fig. 2 (not shown), a reaction effluent produced in the rearrangement of peroxidized cyclohexanol in cyclohexanol solution containing 10% peroxy materials in the presence of hydrogen fluoride is stripped to remove anhydrous hydrogen fluoride, and subjected to counter-current extraction with water whence the spent liquid (low in acid) is neutralized with an aqueous, caustic alkali and further processed to recover the cyclohexanol for return to the initial reaction step and water is removed as an overhead from the extract to form aqueous, hydrofluoric acid azeotrope which is then treated by the process.

Cleaning agent composition for a positive or a negative photoresist

Abstract: The present invention relates to a composition for cleaning a photoresist and is to provide a cleaning composition wherein the residue of the photoresist does not remain on the boundary surface between the cleaned area and the not-cleaned area after a negative photoresist containing pigment is cleaned, soft-baked, exposed and developed. The present invention provides a composition for cleaning a positive or negative photoresist which comprises (a) from 0.1 to 20 wt. % of and alkyl oxide polymer with a molecular weight of from 50 to 2000 and (b) from 80 to 99.9 wt. % of an organic solvent comprising: (b−1) from 1 to 20 parts by weight of dipropylene glycol methyl ether (DPGME), from 10 to 50 parts by weight of N-methyl pyrolidone (NMP) and from 50 to 90 parts by weight of methyl isobutyl ketone (MIBK), or (b−2) from 10 to 90 parts by weight of dimethyl formaldehyde (DMF) or dimethylacetamide (DMAc) and from 10 to 50 parts by weight of n-butyl acetate.

Liquid-phase synthesis of methyl isobutyl ketone over bifunctional heterogeneous catalysts comprising cross-linked perfluorinated sulfonic acid Aquivion polymers and supported Pd nanoparticles

Abstract: The solvent-free hydrogenation reaction of acetone over bifunctional heterogeneous catalysts, comprising cross-linked perfluorosulfonic acid (PFSA) resins and supported Pd nanoparticles, was investigated in the liquid phase under batch conditions. A systematic study was performed by analyzing separately the effect of the main reaction parameters on the reaction outputs. Acetone conversion, selectivity and productivity to methyl isobutyl ketone (MIBK) were measured as a function of the reaction temperature, the amount of catalyst, the Pd loading, the H2 pressure, the reaction time and the cross-linkage of the polymeric support. Reproducible trends were observed that could be explained in terms of properties of the catalyst, conversion path and kinetics. Best compromise results between selectivity (92 %) and productivity (37.0 mmolMIBK gcat−1 h-1) at 19.7 % acetone conversion were obtained for the 0.26Pd@X-link-08-PW79 catalyst, based on 0.8 % cross-linked PFSA support and 0.26 % wt Pd content.