Manufacturing process for the preparation of α,α-branched alkane carboxylic acids providing esters with an improved softness
A manufacturing process for the preparation of α,α-branched alkane carboxylic acids, by reacting a mono-olefin or a precursor thereof, with carbon monoxide in the presence of a strong acid catalyst characterized in that the starting olefin is a dimmer C8 or trimer C12 derived from n-butene, which predominantly comprise 2-butene, that the acid catalyst is composed of BF 3 /H 3 PO 4 in a molar ratio of BF 3 :H 3 PO 4 in the range of from 0.5:1.0 to 5.0:1.0, or of CF 3 SO 3 H, that the weight ratio of the catalyst relative to the mono-olefin is in the range of from 1:1 to 10:1, that the reaction is carried out at a temperature in the range of from 60 to 140° C., and with an initial water content in the catalyst system in the range of from 8 to 25 wt %; and vinyl esters and glycidyl esters derived from said carboxylic acids.
1. A manufacturing process for the preparation of α,α-branched alkane carboxylic acids, the process comprising reacting a mono-olefin feed comprising a dimer (C 8 ) or trimer (C 12 ) of n-butene, comprising predominantly 2-butene, with carbon monoxide in the presence of a strong acid catalyst, wherein the n-butene dimer or n-butene trimer olefin feed has not been fractionated, wherein the acid catalyst is composed of BF 3 /H 3 PO 4 in a molar ratio of BF3:H 3 PO 4 in the range of from 0.5:1.0 to 5.0:1.0, or of CF 3 SO 3 H, wherein a weight ratio of the catalyst relative to the mono-oletin is in the range of from 1:1 to 10:1, wherein the reaction is carried out at a temperature in the range of from 60 to 140° C. and wherein the catalyst has an initial water content in the range of from 8 to 25 wt %.
2. The manufacturing process of claim 1 , wherein the catalyst is BF3/H3PO4 and wherein the molar ratio of BF 3 :H 3 PO 4 is in the range of from 1:1 to 3:1.
3. The manufacturing process of claim 1 wherein the carbon monoxide is at a pressure in the range of from 20 to 100 bar.
4. The manufacturing process of claim 1 wherein the reaction temperature is in the range of from 80 to 140° C. and the carbon monoxide is at a pressure is in the range of from 30 to 90 bar.
5. The manufacturing process of claim 1 wherein the weight ratio of the catalyst relative to the mono-olefin is in the range of from 2:1 to 6:1.
6. The manufacturing process of claim 1 wherein the manufacturing process is a continuous process.
7. The manufacturing process of claim 1 wherein the manufacturing process is a nickel catalyzed oligomerization process or an acid catalyzed oligomerization process.
8. The manufacturing process according to claim 7 , wherein the manufacturing process is the acid catalyzed oligomerization process.
9. The process of claim 1 further comprising preparing glycidyl esters from the α,α-branched saturated carboxylic acids obtained according to the process of claim 1 .
10. The process of claim 1 further comprising preparing vinyl esters from the α,α-branched saturated carboxylic acids obtained according to the process of claim 1 , of which a homopolymer has a Tg lower than −3° C. in the case of C 9 acids and lower than −13° C. in the case of C 13 acids.