Classifications

• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C67/00—Preparation of carboxylic acid esters
  • C07C67/08—Preparation of carboxylic acid esters by reacting carboxylic acids or symmetrical anhydrides with the hydroxy or O-metal group of organic compounds
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C67/00—Preparation of carboxylic acid esters
  • C07C67/30—Preparation of carboxylic acid esters by modifying the acid moiety of the ester, such modification not being an introduction of an ester group
  • C07C67/303—Preparation of carboxylic acid esters by modifying the acid moiety of the ester, such modification not being an introduction of an ester group by hydrogenation of unsaturated carbon-to-carbon bonds

Definitions

• Cycloaliphatic polycarboxylic acid esters such as the esters of cyclohexane-1,2-dicarboxylic acid, are used as a lubricating oil component and as an aid in metalworking. They are also used as plasticizers for polyolefms.
• DE 28 23 165 discloses a process for the hydrogenation of aromatic carboxylic acid esters on supported Ni, Ru, Rh and / or Pd catalysts to give the corresponding cycloaliphatic carboxylic acid esters at 70 to 250 ° C. and 30 to 200 bar.
• US Pat. No. 3,027,398 describes the hydrogenation of dimethyl terephthalate over supported Ru catalysts at 110 to 140 ° C. and 35 to 105 bar.
• the coated and dried and optionally calcined supports are then activated by treatment with a gas stream which contains free hydrogen at temperatures from 30 to 600 ° C., preferably from 100 to 450 ° C.
• the gas stream preferably consists of a mixture of hydrogen and nitrogen. It may be appropriate to increase the hydrogen content in the course of the activation.
• the hydrogen content in the gas mixture can be 10% at the beginning of the activation and over 90% at the end of the activation process.
• the hydrogenation of the process according to the invention is carried out in a pressure range from 5 to 300 bar, in particular from 15 to 220 bar, very particularly from 50 to 200 bar.
• the hydrogenation temperatures are between 50 and 200, in particular between 80 and 160 ° C.
• a phthalic acid monoisononyl ester or a phthalic acid monooctyl ester or a phthalic acid monodecyl ester is preferably converted into the corresponding cyclohexanedicarboxylic acid esters in the process according to the invention.
• Partial esters of the following aromatic acids can be used in the process according to the invention: 1,2-naphthalenedicarboxylic acids, 1,3-naphthalenedicarboxylic acids, 1,4-naphthalenedicarboxylic acids, 1,5-naphthalenedicarboxylic acids, 1,6-naphthalenedicarboxylic acids, 1,7-naphthalenedicarboxylic acids, 1,8 - Naphthalenedicarboxylic acid, phthalic acid, isophthalic acid, terephthalic acid, benzene-1,2,3-tricarboxylic acid, benzene-l, 2,4-tricarboxylic acid (trimellitic acid), benzene-l, 3,5-tricarboxylic acid (trimesic acid), benzene-1, 2 , 3, 4-tetracarboxylic acid, benzene-1, 2,4,5-tetracarboxylic acid (pyromellitic acid).
• mixtures of partial esters can be formed if a mixture of at least two polycarboxylic acids is reacted with an alcohol or an alcohol mixture.
• Cio-alcohol mixtures made from tripropylene by hydroformylation and subsequent hydrogenation
• the partial esters used in the process according to the invention can be pure substances or industrial mixtures, e.g. be from the esterification reaction. Mixtures of this type contain z. B. full ester, polycarboxylic acid / polycarboxylic anhydride (in each case 0 to 15 mol% based on the partial ester), alcohol, water and / or the esterification catalyst.
• partial esters from anhydrides of aromatic polycarboxylic acids generally does not require a catalyst.
• phthalic anhydride converts with alcohols in the temperature range from 110 to 160 ° C in a very short time to the corresponding partial esters.
• the reaction of an anhydride of an aromatic carboxylic acid can be carried out with an excess of alcohol; small amounts of full esters can be present in the partial ester mixture. Since the hydrogenation output is esterified anyway, it is expedient to use as much alcohol in excess in the partial ester preparation as is intended for the esterification stage following after the hydrogenation.
• the catalyst concentration depends on the type of catalyst. In the titanium compounds used with preference, this is 0.005 to 1.0% by mass, based on the reaction mixture, in particular 0.01 to 0.5% by mass, very particularly 0.01 to 0.1% by mass.
• the reaction temperatures are between 160 ° C and 270 ° C, preferably 180 to 250 ° C when using titanium catalysts.
• the optimal temperatures depend on the feed materials, the progress of the reaction and the catalyst concentration. They can easily be determined by experiment for each individual case. Higher temperatures increase the reaction rates and favor side reactions, such as elimination of water from alcohols or the formation of colored by-products. To remove the water of reaction, it is favorable that the alcohol can distill off from the reaction mixture.
• the desired temperature or the desired temperature range can be set by the pressure in the reaction vessel. In the case of low-boiling alcohols, the reaction is therefore carried out under superatmospheric pressure and in the case of higher-boiling alcohols under reduced pressure.
• the reaction of phthalic anhydride with a mixture of isomeric nonanols is carried out in a temperature range from 170 ° C. to 250 ° C. in the pressure range from 1 bar to 10 mbar.
• the amount of liquid to be returned to the reaction can consist partly or completely of alcohol which is obtained by working up the azeotropic distillate. It is also possible to carry out the workup at a later point in time and to remove all or part of the liquid removed by means of fresh alcohol, i.e. H. to replace from an alcohol available in the storage vessel.
• alicyclic polycarboxylic acid esters according to the invention can be used to modify plastic mixtures, for example the mixture of a polyolefin with a polyamide.
• Suitable plastics are the compounds already mentioned. Such mixtures preferably contain at least 5% by weight, particularly preferably 20 to 80% by weight, very particularly preferably 30 to 70% by weight of the alicyclic polycarboxylic acid esters.
• Housings for electrical devices such as kitchen appliances, computer housings, housings and components of phono and television sets, pipelines, apparatus, cables, wire jackets, insulating tapes, window profiles, in interior fittings, in vehicle and furniture construction, plastisols, in floor coverings, medical articles, food packaging, Seals, foils, composite foils, vinyl records, synthetic leather, toys, packaging containers, adhesive tape foils, clothing, coatings, fibers for fabrics.
• Example 1 Hydrogenation of diisononyl phthalate (Vestinol 9) (comparative example) 590 g of Vestinol 9 in a 600 ml pressure reactor at a pressure of 200 bar and at a temperature of 120 ° C. in the presence of the ruthenium catalyst B4168 / 10r with pure hydrogen hydrogenated. After the hydrogen uptake had ended, the reactor was depressurized and analyzed the product. The conversion of diisononyl phthalate was then 99.9%: the yield of cyclohexane-1,2-dicarboxylic acid di (isononyl) ester was 99.8%, with a cis / trans ratio of 97 using 1H NMR spectroscopy: 3 was determined.
• Example 2 Synthesis of phthalic acid mono-isononyl ester 444 g of phthalic anhydride (3 mol) and 432 g of isononanol (3 mol) (precursor of Vestinol 9) were slowly heated in a round bottom flask with an internal thermometer, stirrer and reflux condenser. It started at a temperature of 117 ° C Monoester formation, which was noticeable by a sharp rise in temperature. The heat supply was interrupted immediately after the temperature rose. After about 10 minutes, the batch, which had meanwhile reached its final temperature of about 150 ° C., was cooled. The hydrogenation is quantitative.

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• Chemical & Material Sciences (AREA)
• Organic Chemistry (AREA)
• Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
• Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)
• Polyesters Or Polycarbonates (AREA)

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• 2001
  • 2001-09-27 DE DE10147776A patent/DE10147776A1/de not_active Withdrawn
• 2002
  • 2002-09-14 EP EP02772303A patent/EP1430015B1/de not_active Expired - Lifetime
  • 2002-09-14 JP JP2003532434A patent/JP4320253B2/ja not_active Expired - Fee Related
  • 2002-09-14 ES ES02772303T patent/ES2295408T3/es not_active Expired - Lifetime
  • 2002-09-14 US US10/474,044 patent/US7632961B2/en not_active Expired - Fee Related
  • 2002-09-14 CN CN02812974.1A patent/CN1267398C/zh not_active Expired - Fee Related
  • 2002-09-14 AU AU2002337095A patent/AU2002337095B2/en not_active Ceased
  • 2002-09-14 WO PCT/EP2002/010332 patent/WO2003029179A1/de not_active Ceased
  • 2002-09-14 DE DE50210599T patent/DE50210599D1/de not_active Expired - Lifetime
  • 2002-09-14 AT AT02772303T patent/ATE368638T1/de not_active IP Right Cessation
  • 2002-09-27 TW TW091122422A patent/TWI245039B/zh not_active IP Right Cessation
  • 2002-09-27 AR ARP020103650A patent/AR036685A1/es not_active Application Discontinuation
• 2004
  • 2004-03-26 ZA ZA2004/02386A patent/ZA200402386B/en unknown

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