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7. A hydroformylation process which comprises reacting one or more olefinic unsaturated compounds with carbon monoxide and hydrogen in the presence of a metal› organopolyphosphite ligand complex catalyst and optionally free organopolyphosphite ligand to produce a reaction prod› uct fluid comprising one or more aldehydes, and in which said reaction product fluid contains at least some organo› monophosphite ligand formed during said hydroformylation process, wherein said hydroformylation process is con› ducted at a carbon monoxide partial pressure sufficient to prevent and/or lessen coordination of the organomonophos› phite ligand with said metal-organopolyphosphite ligand complex catalyst 

8. The process of claim 1 which comprises a hydroformylation, hydroacylation (intramolecular and intermolecular). hydrocyanation, hydroamidation, hydroesterification, aminolysis, alcoholysis, carbonylation, isomerization or transfer hydrogenation process. 

9. The process of claim 5 in which the organomonophos› phite ligand is treated with water, a weakly acidic compound, or both water and a weakly acidic compound. 

10. The process of claim 9 wherein the organomonophos› phite ligand is hydrolyzed to a phosphorus acidic compound comprising a hydroxy alkyl phosphonic acid. 

11. The process of claim 3 wherein the temperature difference between reaction product fluid temperature and inlet coolant temperature is less than about 20° C. 

12. The process of claim 5 wherein the organomonophos› phite ligand has (a) a coordination strength with respect to the metal of said metal-organopolyphosphite ligand com- plex catalyst less than carbon monoxide and (b) a coordi› nation strength with respect to the metal of said metal› organopolyphosphite ligand complex catalyst less than the organopolyphosphite ligand of said metal› organopolyphosphite ligand complex catalyst. 

13. The process of claim 1 wherein said reaction product fluid contains a homogeneous or heterogeneous metal› organopolyphosphite ligand complex catalyst or at least a portion of said reaction product fluid contacts a fixed het› erogeneous metal-organopolyphosphite ligand complex catalyst during said hydroformylation process. 

14. The process of claim 1 wherein said metal› organopolyphosphite ligand complex catalyst comprises rhodium complexed with an organopolyphosphite ligand represented by the formula: 

<img src='content_image/933905.jpg'>

wherein X represents a substituted or unsubstituted n-valent organic bridging radical containing from 2 to 40 carbon atoms, each R 1 is the same or different and represents a divalent organic radical containing from 4 to 40 carbon atoms. each R 2 is the same or different and represents a substituted or unsubstituted monovalent hydrocarbon radical containing from 1 to 24 carbon atoms, wherein a and b can be the same or different and each have a value of 0 to 6. with the proviso that the sum of a+b is 2 to 6 and n equals a+b. 

15. The process of claim 14 wherein said metal- organopolyphosphite ligand complex catalyst comprises rhodium complexed with an organopolyphosphite ligand having the formula selected from: 

<img src='content_image/933906.jpg'>

wherein X represents a substituted or unsubstituted divalent hydrocarbon bridging radical containing from 2 to 40 carbon atoms, each R 1 is the same or different and represents a divalent hydrocarbon radical containing from 4 to 40 carbon atoms. and each R $^{2 }$is the same or different and represents a substituted or unsubstituted monovalent hydrocarbon radical containing from 1 to 24 carbon atoms. 

1fi. The process of claim 10 wherein phosphorus acidic compound present in the reaction product fluid of the hydroformylation process is treated with an aqueous buffer solution. 

17. The process of claim 16 wherein the aqueous buffer solution comprises a mixture of salts of oxyacids having a pH of 4 to 9. 

18. The process of claim 16 wherein phosphorus acidic compound present in the reaction product fluid is scavenged by an organic nitrogen compound that is also present in said reaction product fluid and wherein at least some amount of the phosphorus acidic compound of the conversion products of the reaction between said phosphorus acidic compound and said organic nitrogen compound are also neutralized and removed by the aqueous buffer solution treatment. 

19. The process of claim 18 wherein the organic nitrogen compound is selected from the group consisting of diazoles, triazoles. diazines and triazines. 

20. The process of claim 19 wherein the organic nitrogen compound is benzimidazole or benzotriazole. 

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