Societa' Italiana Resine S.i.r. S.p.a.

Condea Augusta S.p.a.

Enichem Augusta S.p.a.

Enichimica Secondaria, S.p.a.

Enichem Augusta Industriale S.r.l.

Sasol Italy S.p.a.

Pierino Radici

Paolo Colombo

Gaudenzio Bianchi

Sergio Custro

Daniele Colombo

Pierluigi Cozzi

Agostino Zatta

Pier D Mattioli

Jacob Ackermann

Mario Ermoni

Umberto Santini

Giuseppe Giuffrida

Rosanna Ontano

Armando Marcotullio

Tullio Pellizzon

Massimo Ciali

Luigi Valtorta

Pietro Erini

Paolo D'Antona

Maria Roberta Rabaioli

Fortunato Crea

Rosario Aiello

Patrizia Frontera

Process for the production of linear alkylaromatic hydrocarbons

A microporous crystalline material named zeolite A-LSX having, in its anhydrous form, an oxides molar composition corresponding to formula (I):

Microporous crystalline material, a process for its preparation and its

Composition of lubricating oil which comprises: a) a greater portion of synthetic lubricating component or a mixture of synthetic lubricating component and a mineral base for lubricating oils, the synthetic lubricating component being prepared by the oligomerization and subsequent hydrogenation and the possible removal of low-boiling by-products, of a composition of olefins basically consisting of:

Bases for lubricating oils and process for their preparation

The present invention relates to an improved process for preparing linear alkylbenzenes falling within such range as used in detergency (C.sub.10 -C.sub.14), which process consists of alkylating aromatic hydrocarbons (above all, benzene) with n-olefins in the presence of AlCl.sub.3, wherein said n-olefins are obtained by dehydrogenating n-paraffins.

Process for producing linear alkylbenzenes

Process for the preparation of linear alkylbenzenes, wherein the benzene is reacted, in the presence of aluminum chloride or aluminum in powder form, with a mixture composed of C.sub.7 -C.sub.20 n-olefins and C.sub.7 -C.sub.20 chloroparaffins, with a molar ratio n-olefins/chloroparaffins between 70:30 and 99:1.

Process for the preparation of linear alkylbenzenes

Stable aqueous suspensions of zeolite 4A which can be easily pumped, containing from 0.5 to 65% of zeolite and from 0.05 to 6 g (per 100 g of zeolite) of a suspending agent, composed of mixtures of ethoxylated alkanols, said mixtures being obtained by ethoxylating: a) biodegradable branched alkanols, having from 10 to 18 carbon atoms and having a single branching in position 2, said mixtures containing at least 2 alkanols having a different number of C atoms; or b) mixtures containing 40-100% of branched alkanols as in a) and 60-0% of linear alkanols having from 10 to 18 C atoms.

Stable aqueous suspensions of zeolite which can be easily pumped

A method of copolymerization in suspension of ethylene with straight-chain alpha-olefins so as to obtain low-density copolymers in two copolymerization steps in an aliphatic hydrocarbon medium having a boiling point above 40.degree. C. In the first reaction step the medium is supplied with a high-activity Ziegler catalyst on a carrier and with ethylene and the alpha-olefin. The copolymerization reaction is carried out for between 20 seconds and 30 minutes and at a temperature between 45.degree. and 65.degree.. The resulting copolymer is used in the second reaction step as a nucleus for polymerizing ethylene and the alpha-olefin, the reaction medium being supplied with additional quantities of ethylene and alpha-olefins so as to maintain the concentration of alpha-olefin in the reaction medium at between 4 and 25% by weight per 100 parts by weight of reaction medium and so as to maintain the pressure of ethylene at between 5 and 25 bars, the reaction being performed at a temperature between 50.degree. and 80.degree. C. for between 1 and 3 hours.

Method of copolymerization in suspension of ethylene with straight-chain

Polyformaldehyde is prepared by polymerizing anhydrous monomeric formaldehyde in an organic, liquid and inert diluent which is a non-solvent for polyformaldehyde, in the presence of a catalyst of the formula: ##STR1## wherein A.sup.(-) is a lactamate group: ##STR2## in which PM is a linear polymethylene chain with from 3 to 13 carbon atoms, possibly substituted with one or more alkyl, cycloalkyl, aryl or alkylaryl radicals, and wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 independently are an alkyl, cycloalkyl, aryl or alkylaryl radical.

Process for the polymerization of formaldehyde

The terminal hydroxyl groups of an acetal polymer are esterified or etherified by reaction with an end-capping agent chosen from anhydrides of carboxylic acids, orthoesters and orthocarbonates, by forming an intimate mixture of polymer in powder form and liquid end-capping agent, the amount of said agent in the mixture being less than that which results in loss of the free-flowing characteristics of the powder, and reacting said mixture under stirring at 50.degree.-170.degree. C.

Process for improving the stability of acetal polymers

Raw gaseous formaldehyde is purified by passing it through a first series of superimposed fluidized beds of solid adsorbent, maintained at 80.degree.-140.degree. C., while continuously circulating solid adsorbent from each bed to the underlying bed and discharging from the lowermost bed the spent adsorbent, delivering the latter to the uppermost bed of a second series of superimposed fluidized beds of solid adsorbent, passing through the latter a stream of inert gas to strip the adsorbed formaldehyde at 130.degree.-150.degree. C., while continuously circulating said spent adsorbent from each bed to the underlying bed and discharging from the lowermost bed the adsorbent thus treated, delivering the latter to the uppermost bed of a third series of fluidized beds of solid adsorbent, and passing through the latter a stream of inert gas to regenerate the adsorbent at 145.degree.-250.degree. C., while continuously circulating the adsorbent from each bed to the underlying bed, discharging the regenerated adsorbent from the lowermost bed and recycling said regenerated adsorbent to the uppermost bed of the first series.

Process for purifying gaseous formaldehyde

Block copolymer of the structure A-B wherein:

Block copolymers

The thermal and chemical stability of etherified acetal homopolymers is improved by heat-treating the latter in the molten state at a temperature of at least 180.degree. C., in the presence of a halide of an alkali or alkaline earth metal, until substantially complete degradation of the unstable polyoxymethylene chains.

Process for improving the stability of etherified acetal homopolymers

An etherified acetal homopolymer is stabilized by heat-treating said homopolymer suspended in a liquid diluent chosen from water or mixtures thereof with polar organic compounds, preferably in the presence of a basic compound, at a temperature of 100.degree.-160.degree. C and below the melting point of the homopolymer, thereby to substantially degrade the unstable fraction of said homopolymer.

The unstable terminal hydroxyl groups of acetal polymers are etherified in a liquid reaction medium in the presence of organic additives.

Process for the preparation of etherified acetal polymers

Formaldehyde present in a waste water containing lower carboxylic acids is recovered by reacting said waste water at 0.degree. to 90.degree. C. with the amount of ammonia required for converting said formaldehyde into hexamine and the latter is recovered in solid form by evaporating the resulting solution. The solid hexamine thus recovered has a content in lower carboxylic acids not exceeding 0.05 wt.%, is practically free from other impurities and is suited for any conventional use.

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Turate, Italy

Pierino Radici