CA1244053A - Process for the preparation of aldehydes - Google Patents

Process for the preparation of aldehydes

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Publication number
CA1244053A
CA1244053A CA000482937A CA482937A CA1244053A CA 1244053 A CA1244053 A CA 1244053A CA 000482937 A CA000482937 A CA 000482937A CA 482937 A CA482937 A CA 482937A CA 1244053 A CA1244053 A CA 1244053A
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Canada
Prior art keywords
rhodium
water
reaction
soluble
carbon atoms
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Expired
Application number
CA000482937A
Other languages
French (fr)
Inventor
Helmut Bahrmann
Boy Cornils
Werner Konkol
Wolfgang Lipps
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Ruhrchemie AG
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Ruhrchemie AG
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    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07CACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C47/00Compounds having —CHO groups
    • C07C47/02Saturated compounds having —CHO groups bound to acyclic carbon atoms or to hydrogen
    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07CACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C45/00Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds
    • C07C45/49Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by reaction with carbon monoxide
    • C07C45/50Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by reaction with carbon monoxide by oxo-reactions

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)

Abstract

ABSTRACT OF THE DISCLOSURE
A novel process for the preparation of aldehydes by reacting olefins with carbon monoxide and hydrogen in the presence of a catalyst system comprised of rhodium in metallic form or as a compound and a water-soluble quaternary ammonium salt of a mono, di or trisulfonated arylphosphine.

-A-

Description

It is known that aldehydes and alcohols can be pre-pared by the reaction of olefin's with carbon monoxide and hydro-gen which reaction is catalyzed by hydridometal carbonyls, pr~-ferably those of the metals of the 8th ~roup of the Periodic Table. Apart from cobalt which i.s'widely used.in industry as a catalyst metal, rhodium has. a~so been gaining in:importance recently. In contrast to cobalt, xhodium makes it possible for the reacti.on to be carried out at low pressure and furthermore, the reaction takes place wi.th enhanced formation of stffight-chaine~ n-aldehydes with iso-aldehydes only being formed to a minor de~ree. Finally, the hydxogenation of olefins to saturated hydrocarbons is also appreciably lower w.ith rhodi.um catalysts than with cobalt catalysts.
In the commerical processes, the rhodium catalyst is in:the form of a modified h~drido~hodium.carbonyl containi~g addi.tional ligands, if'n.ecessary in'excess. Ter:tiary phosphines or phosphites ha~e pro~ed to be parti.cularly good as ligands and by using them~ it'is'p~ssible to reduce.the reac:tion pressure to values under 300'bar (3 x 104kPa). Howe~er,.the separati0n of the reaction products and the recovery of the catalysts dis-solved homo~eneously in the reaction product present problems in'this'process. Generally, the reaction product is distilled out of the reaction mixture, but this'method can only be used in'practice for the hyd~oformylation.of low molecular weight olefins, i.e. olefins with up to about 5 carbon atoms in the molecule due to the thermal sensiti~ity of:the aldehyd.es and alcohols formed. Furthermorer i.t.has been shown that the thexmal loading of the distillation product also leads to considerable catalyst losses due to decomposition of the rhodium complex compounds.

The said shortcomings are avoided by the use of catalyst systems which are soluble in'water and such catalysts are,for example, described in the DE 26 27 354. Solubility of the rhodium complex compounds is achieved by the use of sul-fonated triarylphosphines as complex components. In this ver-sion of the process, the catalyst is'separated ~rom the reac-tion product a~ter completion of the hydroformylation reaction simply by separation of the aqueous and organic'phases, i.e.
without distillation and thus without additional thermal process steps. A further characteristic'o~ this method is'that n-alde-hydes are formed with a high selecti~'ity from terminally unsatu-rated olefins and iso-aldeh~des are ormed only to a minor degree. Apart from sul~onated triarylphosphines, carboxylated triarylphosphines are also used as complex components of ~ater-soluble rhodium comple~ compounds.
The known processes have proved to be admirably suit-able for the hydroformylation o~ lower olefins, in'particular ethylene and propylene. However, if'higher oleEins such as hexene, octene or decene are used, the conversio~ and/or the selectivity towards n-compounds drop(s) appreciably. Thus, the reaction is often no longer economical on a com~ercial scale. The drop in'~ield is caused by the fact that higher olefins are less s~luble in water since the reaction between the two reactants takes place in'the aqueous phase.
Admittedly, DE 31 35 i27 does teach hydroformylation of olefinic compounds in a system containing an aqueous phase and an organic phase, which is ither immiscible or only sllg~tly miscible with it in the presence of solubili~ers. The practical performance of this'reaction is lim'ited exclusively to the use of monosulfonated or monocarboxylated triarylphosphines
-2~

as a component of the rhodium complex compoundO It has been shown that the monosulfo~ted triphenylphosphine in particular leads only to a moderate conversion and that the selectivity towards straigHt-chained n-aldehydes is low.
Conversion and selectivity can be improved by using trisulfonated triarylphosphines instead of monosulfonated com-pounds. However, an unsa,ti$factory aspect of this.~process variant is that rhodi.um and water-soluble phosphine are removed w.ith the organi.c'reaction product - even if only in small amounts-so that in'many cases an additional working-up step is necessary.
A further disadvantage is.the related lowering of.the normal-iso ratio.

It is an object of.the invention to ov,ercome the dis-advantages of the prior art and develope , a procedure which also permits the hydroformylation of higher olefins in a multi-phase system consisting of aqueous catalyst solution and organic start-ing materials and in'so~e cases reactio,n products as well as gaseous reactants.
This'and other objects and advantages of the invention will become obvious from the following detailed description.

In the novel process of,the i'nvention fo~,pr~pa~ation of aldehydes by reacting olefins with carbon monoxide and hydrogen in the liquid'phase in'the presence of water and rhodium in metallic form or as a compound a.s well as a water-soluble aryl-phosphine at temperatures of 20 to 150C and l.to 200 bar~(100 to 2 x 104 kPa)j the improvement comprï.s'es that the water-soluble phosphin'e has the formula ~c~

A - N - C

L P \ Ar - Xx2 ¦ l D

where Ar is aryl and X is a sulfonic acid, xl, x2 and x 3 are 0 or 1 with the proviso that at least one of xl, x2 or x3 is 1, A
i5 selected from the group consisting o an alkyl o~ 1 to 18 carbon atoms and aralkyl of 7 to 18 carbon atoms and B,C,D are alkyl of 1 to 4 carbon atoms and n is a whole number between and 3.
Surprisingly, it has been proven that when waber-soluble phosphines are used in the process of the invention the high activity and selectivity of the catalyst system is maint-ained even when high olefins are hydro~rmylated. At the same time, however, the amount of phosphine removed with the organic reaction product is also reduced considerably.
The water-soluble phosphinesused in the new process obvi~usly improve the solubility of the organic substrate in the aqueous phase and thus contribute towards an increase in the conversion. Their extremely low solubility in the organic phase means that they themselves and~he metallic components of the catalyst system are either not removed with the reaction product from the reaction zone, or if so, only a negligibly small amount~

Thus there is no need for a separate working-up step for the recovery of rhodium from the aldehyde.
of the water-soluble phosphines of the above formula, preferred compounds are those wherein Ar is phenyl or naphthylJ
the sum of xl, x2 and x3 is 2 or 3 and B,C and D are the same alkyl of 1 to 4 carbon atoms.

Examples of water-soluble phosphines suitable for carrying out the new process are triphenyl trisulfonates and triphenyldi---sul~onates with.the~ollo~iny ca~i~ns: tr~hylc~tYla~oniu~ trimethyl-dodecylammonium, tributyldodecylammonium, dodecylethyl-dimethyl-ammonium, triethylbenzylammonium.
The phosphines used i.n:the claimed process are pre~
pared by treating sulfonated triar~lphosphines with oleum and it is possible to prepare mono, di or trisulfonated arylphos-phines by variation of the reaction conditions, particularly the.reaction time, reaction temperature and the.ratio of tri-arylphosphine to sulfuric: trioxide.
It is practical to first.reco~er amine s.alts from the sulfonation product which are in'soluble in'water but soluble in organic'solvents. They are then converted to the desired "onium" salt of.the triarylphosphine by treatment with a quater-nary ammonium hydroxi.de The reac.tion of the olefin'w.ith hydrogen. and carbon monoxid'e by the process o~ the inventi.oh takes place at tempera-ture of 20 to 150~C, particularly S0 to 120C and pressures of ..
1 to 200 bar (100 to 2 x 104 kPa), particularly 10 to 100 bar (1 x 103 to 1 x 104 kPa)~
The catalyst can be added to the reaction system in a preformed state but it can also be successfully prepared in the reaction mixture from the components.rhodium or a rhodium com-pound and the aqueous solution of the quaternary ammonium salt of the sulfonated triarylphosphine under reaction conditions, i.e. in the presence of the olefin. In addit'ion to metallic rhodium in finely distributed ~orm, water-soluble rhodium salts such as rhodium chloride, rhodium sulfate, rhodium acetate or compounds soluble in organic media such as rhodium-2-ethylhex-anoate or insoluble compounds such as rhodium oxides can be used as sources of rhodium.
The rhodium concentration in the aqueous catalyst solution is 10 to 2000 ppm by weight based on the soluti~n. The quaternary ammonium salt of the sulfonated phosphine is added in such an amount that for 1 g atom of rhodium, 1 to 300 mol, pre-ferably 2 to 100 mol, of phosphine compouna are present. The pH
value of the aqueous catalyst solution should not be below 2 and generally, a pH value of 2 to 13, preferably 4 to 10 is established.
The composition of the sy~thesis ~as, i.e. the ratio of CO to hydrogen can be varied ~ithin wide limits. Generally, a synthesis gas is used where the ~olume ratio of CO to hydrogen is l : 1 or only deviates slightly from this value. The reaction can be carried out both as a batch process and continuously. The process of the invention is successfully used for hydroformyla-tion of stright-chained or branched oleins of four or more and in particular with six to twenty carbon atoms. The double bond in these atoms can be terminal or internal.
The following examples ser~e to illustrate the inven-tion more closely without limiting it to the embodiments dQscri-bed therein. To characterize the efficiency of the catalyst s,ystems, apart from the ratio of n-aldehyde to i-aldehyde, the term "activity" is de~ined as mol aldehyde g-atom Rh x min The formation of alcohols and hydrocarbons is minimal.

EXAMPLE 1 (Comparison) 420 g (corresponding to 355 ml3 of an aqueous solu-tion containing 15.5% by weight of the sodium salt of tri~m-sul-i3 fophenyl~ phosphine and 400 ppm of rhodium in the form of rhodium acetate were placed in a l liter autoclave with a dip-pipe and then, synthesis gas (CO/H2 = l:1) was orced in up to a pressure of 25 bar. The reaction solution was treated with the synthesis gas for 3 hours at 125C accompanied by stirring a~d it was then cooled to about 30C. The stirring was stopped and after a settling period of 15 minutes, the excess solution (~61 g) was forced out th~gh the dip-pipe and analyzed and the residual solution remained in the autoclave. After the resumption of .
stirring, 170 g of n-hexene-l were pumped through a pressure pipe into the autoclave and while the pressure was maintained at 25 bar, the mixture was heated to 125C over a period of 3 hours.
It was then allowed to cool to 30C and settle. After a 15 minute settling p.eriod,.the uppermost organic phase was forced out through the dip-pipe and was weighed and subjected to a gas chromatographic analysis.
Hydroormylation was repeated a.total o~ 6.times where-by more or less the same results were achieved. The activity values listed in Table I relate to the amounts oE aqueous and organic phase6present in the autoclave after each run.

~2~

lP~ o ¦ o i ~ ~ ~o~P G ~
1- u~ tn O
3 ~ 4 ~ p o~ ~!

X ~. ~ o, r~

- ~D
I_ ~- W Cl~ ~ ~_ 1- I-p U~ ~ 1~
~t~ ,_~
1' 1' Ul ~ ~ ~

1~ ~P

~ O

~ o~

-;8 ~%~

To determine the total amount of rhodium and phos-phorus removed with the organic phase, the organic components drawn off from the reactor in the individual tests were combined, concentrated to about l/lOth of their original volume and analyzed.
0.017 ppm by weight of rhodium and 0.34 ppm by weight of phosphorus (in each case based on the original organic phase) were found.

Example 1 was repeated with the exception that 315 g (corresponding to 295 ml) of an aque~us solution of the trimethyl-benæylammonium salt of tri-(m-sulfophenyl)phosphine with a P(III) content of 0.308% hy weight and 158 g of n-hexene-l were used in the hydroformylation process instead o~ the sodium salt. The test results are reported in Table 2. The rhodium and phosphorus losses were determined by the method described in Example 1. An average of 0.029 ppm by weight of rhodium and 0.98 ppm by weight of phosphorus were removed with the organic product, i.e. only slightly more than when the normally employed sodium salt of tri-(m-sulfophenyl)phosphine was used.

-co ~ - ~o oo ~
~ o l`
a~

~1 ~D N
o Ln (5 ~) ~I N

C~ O
:) ~1 ~

~D .
a~ ~ ,I N

O U~ ~1 . el~ Ln ~ N Ln ,~
N 'r ,J Ln ~i ~ Ln ~ NN 1`
~ ~') ~¦ 00 ~
N
~ N Ln 1`
E-~ cn ~

00 ~ In O ~r ~1 ~ r~
, a~
_ ~

Ul O ~
~: a) ~ .~
rl h ~ ~`1 k _ a) ~ a) x ~1 C~ ~
ho ~ .~ ~ _,~ 8
4~ o~O
o Y U~ U~ ,, h 1~ n~ h0 ~ O O ~ ~ $ ~ ~
U~
O ~ h ~>
.
O O ~ h Z ~ d O
__ ~1.0--' EXAMPhES 3 to 5 Examples 3 to 5 were carried ou-t by the method descri-bed in Example 1 with the exception that instead of the sodium salt of tri-(m-sulfophenyl)phosphine; 420:g (corresponding.to 390 ml) of an aqueous solution containing 46~ by weight of the dodecylethyldim.ethylammonium salt of tri-'(m-sul~phenyl)phosphine (Example 3); 820 g (corresponding to 740 ml) of an aqueous solu-tion contain'ing 25% by weight of the benzyltrimethylammonium salt of di-'~m-sulfophenyl)-phenylphosphine'(Example 4); 420 g (corres-ponding to 39Q:ml) of an aqueous solution contain'ing 23~ byweigh't of the benzyltriethylammonium salt of.tri.-:(m-sulfophenyl) phosphine (Example 5) were used. The.test.results are.reported in Table 3.
5 `~

a o ~ o o ,~
~o ~ o . ~ o ~ o o ~
o ~ o V~ o ,' a) . O v~

.
. o o
6~ . tu ~d ~t X . ~1 0 ~1 X rC ~ ~ ~
~ U~ o ~ o W , ' : ~ o .
., . " ~
; b4 1~ ~0 o o o ~ ~,, ~ ~ ~
. a~
.` ,1 ~ X ~ U~
a) r~ E~
~ ~ cn ~ . ~ .
E~ I t~ ~ .
E~
.
., ~ . .~ , .~ ~ o . ~
~ ~ ~ ~ , ~
,_ ~ X o ~ ;~ o ., ~ ~ o ~ ~ ~ a~
O
Ei ~ ~ .,~
' ~ o ~ V~ ~ .C
. ~I
~ ~ O ~ ~ a~ ~
~7 0 ~ ~ ' rC ~ C) ~ ~4 0 ~ ~ .r~ rl E~ O O h .~ u h h ~ U ~ ~ ~
,,~ V) ~ ~ ~ ~ ~1 ~1 u ~ :~
O ~ ~ Ei ~rl ~ td ~ o In O a>
E- ~ O ~ U ~ ~ .n a) u ~ ~d a o ~ ,~
E- O ~ ~ z ~ ~ ~ u~

' , , o ' ' ' , ' ,. . ~

ii3 EXAMPLES 6 and 7 Examples 6 and 7 were also carried out under the con-ditions of Example 1 but with stYrene as the olefin. In ~xample 6 (comparison), the Na-salt (420 g corresponding to 375 ml of a 22~ by weight solution) and in Example 7, the dodecylethyldi-methylammonium salt (420 g corresponding to 391 ml of a 23% by weight solution) of tri-(m-sulfophenyl)-phosphine were used. The results of the tests are reported in Table 4 and as can be clearly seen, the quaternary ammonium salt favored the formation of a-phenylpropionaldehyde.

o s`
O `D
u) o ~
: ~ o ~ o v~ o~o o`
.
:~
~d ~
~ ~ o ' ' a) o ~ u~ ~
l-' '' ~d ~ O ~ 11 ~0 ~ l x ~ o o ~o o o ~ ~

. ,:, E-.
' ' ' ' ,~ ,~ ~ O
,u~ ~
) X tl~ rt h t~
~ ~ O ~ ~
' '' ' O ~d ~ ~ O O
o~ O n~ h ~ ~ ~
~ ~ ~ 4~ cd td ~
E~ o ~ ~ ~ u O ~ H ~ U
-- O u) O
o ~ ~
O ~ ~SL ~ Z ~ ~O t i`3 Various modifications of the process o~ the in~ention may be made without departing rom the spirit or scope thereof and it is to be understood that the invention is intended to 4 be limited only as deined in the appended claims.

Claims (5)

The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:.
1. In a process for the preparation of aldehydes by reacting olefins with carbon monoxide and hydrogen in the liquid phase in the presence of water and rhodium in metallic form or as a compound as well as a water-soluble arylphosphine at tempera-tures of 20 to 150°C and 1 to 200 bar (100 to 2 x 104 kPa), the improvement comprising that the water-soluble phosphine has the formula where Ar is aryl and X is a sulfonic acid x1, x2 and x3 are 0 or 1 with the proviso that at least one of x1, x2 or x3 is 1, A is selected from the group consisting of an alkyl of 1 to 18 carbon atoms and aralkyl of 7 to 18 carbon atoms and B,C,D are alkyl of 1 to 4 carbon atoms and n is a whole number between 1 and 3.
2. The process of claim 1 wherein Ar is phenyl or naphthyl.
3. The process of claim 1 wherein the sum of x1, x2 and x3 is 2 or 3.
4. The process of claim 2 wherein the sum of x1, x2 and x3 is 2 or 3.
5. The process of claim 1 wherein B,C and D denote the same alkyl.
CA000482937A 1984-06-01 1985-05-31 Process for the preparation of aldehydes Expired CA1244053A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP3420491.1 1984-06-01
DE19843420491 DE3420491A1 (en) 1984-06-01 1984-06-01 METHOD FOR PRODUCING ALDEHYDES

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CA1244053A true CA1244053A (en) 1988-11-01

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EP (1) EP0163234B1 (en)
JP (1) JPS611633A (en)
KR (1) KR880001353B1 (en)
AT (1) ATE50556T1 (en)
AU (1) AU577382B2 (en)
BR (1) BR8502451A (en)
CA (1) CA1244053A (en)
DE (2) DE3420491A1 (en)
HU (1) HU204249B (en)
PL (1) PL253588A1 (en)
RO (1) RO91880B (en)
SU (1) SU1537134A3 (en)
ZA (1) ZA853971B (en)

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DE3420493A1 (en) * 1984-06-01 1985-12-05 Ruhrchemie Ag, 4200 Oberhausen QUARTERS OF AMMONIUM SALTS OF SULPHONED TRIARYLPHOSPHINS
DE3534314A1 (en) * 1985-09-26 1987-04-02 Ruhrchemie Ag METHOD FOR PRODUCING ALDEHYDES
DE3546123A1 (en) * 1985-12-24 1987-06-25 Ruhrchemie Ag METHOD FOR PRODUCING ALDEHYDES
DE3616057A1 (en) * 1986-05-13 1987-11-19 Ruhrchemie Ag METHOD FOR PRODUCING ALDEHYDES
US4716250A (en) * 1986-07-10 1987-12-29 Union Carbide Corporation Hydroformylation using low volatile/organic soluble phosphine ligands
US4825003A (en) * 1986-09-17 1989-04-25 Mitsui Toatsu Chemicals, Incorporated Production process of 2-chloropropionaldehyde
US4731486A (en) * 1986-11-18 1988-03-15 Union Carbide Corporation Hydroformylation using low volatile phosphine ligands
US5113022A (en) * 1988-08-05 1992-05-12 Union Carbide Chemicals & Plastics Technology Corporation Ionic phosphites used in homogeneous transition metal catalyzed processes
DE3942954A1 (en) * 1989-12-23 1991-06-27 Hoechst Ag PROCESS FOR THE PREPARATION OF ALDEHYDE
FR2671078A1 (en) * 1990-12-31 1992-07-03 Rhone Poulenc Chimie REAGENT AND METHOD FOR THREE - PHASE HYDROCARBONYLATION.
US5288818A (en) * 1991-08-20 1994-02-22 Exxon Chemical Patents Inc. Method for separating a water soluble noble metal catalyst from a noble metal catalyzed hydroformylation reaction
US5215667A (en) * 1991-08-20 1993-06-01 Exxon Chemical Patents Inc. Method for separating water soluble noble metal catalyst from a noble metal catalyzed hydroformylation reaction
DE4242725A1 (en) * 1992-12-17 1994-06-23 Hoechst Ag Process for the production of higher, predominantly unbranched, primary alcohols
DE4440552A1 (en) * 1994-11-12 1996-05-15 Hoechst Ag Process for the preparation of formyl carboxylic acid esters
US6756411B2 (en) 1995-06-29 2004-06-29 Sasol Technology (Proprietary) Limited Process for producing oxygenated products
KR100451631B1 (en) * 2002-05-17 2004-10-08 주식회사 바름인 Preparation of fermented soybean product enriched γ-aminobutylic acid and phytoestrogens using Bifidobacterium breve K-110 of korean-type lactic acid bacteria
KR100460697B1 (en) * 2002-06-01 2004-12-09 고을빛 생식마을 (주) Manufacturing Method for Soaking and Germinated Soybean Containing High Isoflavone
DE102008044783B4 (en) 2008-08-28 2012-05-16 Oxea Gmbh Process for the recovery of aliphatic C3 to C10 aldehydes from high boilers by thermal treatment
DE102009004655B4 (en) 2009-01-15 2013-02-14 Oxea Gmbh Process for the preparation of aldehydes
DE102009016651B4 (en) 2009-04-07 2011-11-17 Oxea Gmbh Process for the preparation of aldehydes

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US3928232A (en) * 1972-10-24 1975-12-23 Chevron Res Aryl sulfonate stabilized cobalt carbonyl complex compounds
US4248802A (en) * 1975-06-20 1981-02-03 Rhone-Poulenc Industries Catalytic hydroformylation of olefins
FR2314910A1 (en) * 1975-06-20 1977-01-14 Rhone Poulenc Ind Aldehyde prepn. by olefine hydroformylation in liquid phase - using catalyst system contg. sulphonated aryl phosphine and rhodium (NL 22.12.76)
NO156742C (en) * 1979-03-28 1987-11-18 Union Carbide Corp PROCEDURE FOR THE PREPARATION OF A HYDROFORMAL MEDIUM AND THE PROCESS FOR THE PREPARATION OF ALDEHYDES.
FR2473504A1 (en) * 1979-10-31 1981-07-17 Rhone Poulenc Ind Aldehyde prepn. from hydrogen, carbon mon:oxide - and olefin, in presence of cobalt cpd. and water soluble phosphine
GB2085874B (en) * 1980-09-04 1984-08-08 Johnson Matthey Plc Hydroformylation of olefins
DE3234701A1 (en) * 1982-09-18 1984-04-05 Ruhrchemie Ag, 4200 Oberhausen METHOD FOR PRODUCING ALDEHYDES
DE3413427A1 (en) * 1984-04-10 1985-10-17 Ruhrchemie Ag, 4200 Oberhausen METHOD FOR PRODUCING ALDEHYDES

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RO91880B (en) 1987-07-31
JPH0140019B2 (en) 1989-08-24
SU1537134A3 (en) 1990-01-15
EP0163234A3 (en) 1987-05-27
DE3420491A1 (en) 1985-12-05
KR860000237A (en) 1986-01-27
BR8502451A (en) 1986-01-28
PL253588A1 (en) 1986-02-11
EP0163234B1 (en) 1990-02-28
AU577382B2 (en) 1988-09-22
DE3576150D1 (en) 1990-04-05
HU204249B (en) 1991-12-30
ZA853971B (en) 1986-01-29
RO91880A (en) 1987-07-30
EP0163234A2 (en) 1985-12-04
JPS611633A (en) 1986-01-07
ATE50556T1 (en) 1990-03-15
HUT39703A (en) 1986-10-29
AU4321885A (en) 1985-12-05
KR880001353B1 (en) 1988-07-28

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