Abstract:
A strong-acid cation exchange resin in acid form is contacted with an alkylcarbamoyl alkylthioester in the presence of water for producing a strong-acid cation exchange resin comprising a plurality of acid groups being partially neutralized with a mercaptoalkylamine. The produced partially neutralized cation exchange resin is useful as a catalyst in a process of producing a bisphenol by reaction of a phenolic compound with a carbonyl compound.
Abstract:
A catalyst useful for the condensation of an aldehyde or ketone starting material with a phenol is an insoluble mercaptosulfonic acid compound. The heterogeneous catalysts comprise catalytically-active species represented by formula (a). L is an optional linking group and is a bond, which catalytically active species is attached by the bond to an insoluble organic or inorganic support; or a catalytically-active species represented by formula (b), wherein L' is an optional linking group, is a bond and theta ' and theta '' are residues of theta , and a and b are independently selected from integers equal to or greater than 1.
Abstract:
A strong-acid cation exchange resin in acid form is contacted with an alkylcarbamoyl alkylthioester in the presence of water for producing a strong-acid cation exchange resin comprising a plurality of acid groups being partially neutralized with a mercaptoalkylamine. The produced partially neutralized cation exchange resin is useful as a catalyst in a process of producing a bisphenol by reaction of a phenolic compound with a carbonyl compound.
Abstract:
The invention relates to the initiation of a method for producing bisphenols by reacting phenol with acetone in the presence of sulfonated cross-linked polystyrene resins. The invention is characterized in that: a) the initiation is carried out with an acetone concentration, which is reduced compared to the optimal continuous operation state, and with a phenol concentration, which is increased compared to the optimal continuous operation state, under a reduced throughput, and; b) under temperature control, the educt quantity and the acetone content of the reactor inflow are subsequently increased in stages or continuously until the continuous operation state is attained.
Abstract:
A process for producing bisphenol A which comprises reacting excess phenol and acetone with an acid ion-exchange resin catalyst to yield bisphenol A, sending it to a crystallization/separation step where the bisphenol A is precipitated as crystals of an adduct thereof with phenol, isolating the crystals, and removing the phenol to recover purified bisphenol A, wherein at least part of the phenol to be reacted with acetone is the phenol which has been obtained from the crystallization/separation step and has undergone adsorption with an adsorbent which is a cross-linked gel-form resin in which the molar ratio of units derived from a cross-linking agent to units derived from a monovinylaromatic compound is from 0.01 to 0.8. The adsorption is advantageously conducted by passing the phenol through a fixed-bed adsorbent layer packed with the adsorbent having an average diameter of 0.05 to 2 mm at a temperature of 50 to 80 DEG C and a linear velocity of 0.5 to 30 m/hr. Thus, compounds causative of catalyst deterioration are adsorptively removed. Since the catalytic activity can hence be prevented from deteriorating, the catalyst has a prolonged life.
Abstract:
The invention provides an ion exchange resin catalyst containing a sulfonated styrene-divinylbenzene copolymer and having porous structure. The catalyst of this invention is suitable for the condensation of phenols and carbonyl compounds to form bisphenols, and particularly for the condensation of phenol and acetone to form bisphenol A.
Abstract:
In an embodiment, a catalyst comprises a sulfonated polymerization product of a monovinylaromatic monomer and less than 2.0 wt% of a polyvinyl aromatic monomer, based on the total amount of monomer, and wherein the catalyst comprises 0.1 to 1.0 millimole of sulfone bridges per gram of dry catalyst. In another embodiment, a method of producing a bisphenol comprises reacting a phenolic compound with one or both of an aldehyde and a ketone in the presence of a catalyst to produce a bisphenol; wherein the catalyst is a sulfonated polymerization product of a monovinylaromatic monomer and less than 2.0 wt% of a polyvinyl aromatic monomer, based on the total amount of monomer, and wherein the catalyst comprises 0.1 to 1.0 millimole of sulfone bridges per gram of dry catalyst.
Abstract:
A process for producing bisphenol A whereby the life of an acid type ion exchange resin, which has been partly modified with a sulfur-containing amine compound, employed as a catalyst can be prolonged and a high bisphenol productivity per catalytic unit can be achieved. A process for producing bisphenol A by reacting acetone and phenol with the use of an acid type ion exchange resin, which has been partly modified with a sulfur-containing amine compound, as a catalyst and an alkyl mercaptan as a promoter, characterized in that use is made of a multi-step reactor provided with at least two reactors connected in series and the molar ratio of total alkyl mercaptan/total acetone and the molar ratio of total acetone/phenol are increased with a decrease in the conversion ratio of phenol.
Abstract:
A cationic exchange resin which is obtained by sulfonating a copolymer resin from a monovinyl monomer, which is mainly a styrenic monomer, and a divinyl monomer, characterized in that at least a part of the divinyl monomer is a polycyclic aromatic divinyl monomer, and it has a crosslinking degree represented by polycyclic aromatic divinyl monomer/total monomer of 1 mole % or more and has an exchange volume of 0.7 meq/ml-wet resin or more, and the ion exchange resin particles have an average crushing strength (Chatillon value) of 200 g or more/particle at a particle diameter of 600 mu m. The polycyclic aromatic divinyl monomer is preferably diphenyl biphenyl. The cationic exchange resin has high strength and is excellent in activity, and is useful as a catalyst for producing bisphenol A from phenol and acetone.