The present invention relates to a process for preparing a terephthalic diester by reacting terephthalic acid with at least one alcohol, wherein terephthalic acid is suspended in the alcohol in a dispersing tank, the preliminary suspension is passed from the dispersing tank into a reactor and converted in the presence of an esterification catalyst, and water of reaction is distilled off together with the vapor as alcohol-water azeotrope, the vapor is at least partly condensed, the condensate is separated into an aqueous phase and an organic phase, the organic phase is dewatered and the dewatered organic phase is passed at least partly into the dispersing tank.

The present invention relates to a process for preparing a terephthalic diester by reacting terephthalic acid with at least one alcohol, wherein terephthalic acid is suspended in the alcohol in a dispersing tank, the preliminary suspension is passed from the dispersing tank into a reactor and converted in the presence of an esterification catalyst, and water of reaction is distilled off together with the vapor as alcohol-water azeotrope, the vapor is at least partly condensed, the condensate is separated into an aqueous phase and an organic phase, the organic phase is dewatered and the dewatered organic phase is passed at least partly into the dispersing tank.

A reactor comprising a first portion having a generally cylindrical housing, an inlet at one end of said first portion housing, the opposed end of said first portion housing being the outlet of said first portion, where said first portion includes a rotatable shaft positioned axially within said housing and including at least two shearing paddles extending radially from said rotatable shaft and a second portion having a generally frustoconical housing having a first end larger than a second end, said first end constituting an inlet to said second portion and coextensive with said opposed end of said first portion housing, and an outlet at said second end, where said second portion includes a rotatable shaft positioned axially within said housing and including at least one generally helical flight extending radially from said rotatable shaft.

Fouling of an MMA process is reduced by strategically removing an aqueous slip stream.

A process comprises polymerizing an olefin monomer in a loop reactor in the presence of a catalyst and a diluent, and producing a slurry comprising solid particulate olefin polymer and diluent. The Biot number is maintained at or below about 3.0 within the loop reactor during the polymerizing process. The slurry in the loop reactor forms a slurry film having a film coefficient along an inner surface of the reactor wall, and the film coefficient is less than about 500 BTU.Math.hr.sup.−1.Math.ft.sup.−2.Math.° F..sup.−1.

The present invention addresses the problem of providing a method for producing microparticles. Composite microparticles are separated by mixing at least two kinds of fluids to be processed in a thin film fluid that is formed between approachable and separable opposing processing surfaces that relatively rotate, wherein the fluids to be processed are a metal fluid comprising at least two kinds of metal elements that are dissolved in a solvent in the form of metal and/or metal compound and a fluid for separation containing at least one kind of separating substance for separating a composite substance comprising the at least two kinds of metal elements. The molar ratio between the at least two kinds of metal elements contained in the resulting microparticles is controlled by controlling the circumferential speed of the rotation at a confluence where the metal fluid and the fluid for separation merge at this time.

A radical polymerization method that enables synthesis, at a high conversion rate, of polymers having a relatively uniform molecular weight and is applicable to various monomers, and an apparatus used for the method. A reaction solution containing monomer and initiator is continuously or intermittently circulated in the apparatus and is heated in a heating-initiation unit to a predetermined temperature simultaneously across a radial direction of a cross section of the flow path whereby the initiator located in a particular volume of the reaction solution is cleaved all at once. The apparatus includes a heating medium production unit 10, a heating medium-reaction solution mixing unit 20, a cooling unit 30, and a recovery unit 40 for a reaction mixture, all communicatively connected by the flow path and optionally a heating reaction unit 60, a cooling unit 70, and a recovery unit 80, all communicatively connected by the flow path.

A flow reaction facility 10 includes a reaction section 23, a collecting section 26, a system controller 15, a first flow velocimeter to a third flow velocimeter 35a to 35c, a thermometer 35d, and a soft sensor 38. The first flow velocimeter to the third flow velocimeter 35a to 35c and the thermometer 35d detect reaction conditions in the reaction section 23, and output the detected reaction conditions as detection information. The soft sensor 38 applies the above detection information to a prediction function generated in advance using measurement data, and calculates a reaction result in the reaction section 23 as an arithmetic reaction result. The system controller 15 controls the reaction section 23 on the basis of the arithmetic reaction result.

A flow reaction facility 10 includes a reaction section 23, a collecting section 26, a system controller 15, a first flow velocimeter to a third flow velocimeter 35a to 35c, a thermometer 35d, and a soft sensor 38. The first flow velocimeter to the third flow velocimeter 35a to 35c and the thermometer 35d detect reaction conditions in the reaction section 23, and output the detected reaction conditions as detection information. The soft sensor 38 applies the above detection information to a prediction function generated in advance using measurement data, and calculates a reaction result in the reaction section 23 as an arithmetic reaction result. The system controller 15 controls the reaction section 23 on the basis of the arithmetic reaction result.

A method and an apparatus for preparing an alpha-olefin. The method includes supplying a feed stream including a gaseous ethylene monomer to a monomer dissolution device to dissolve the feed stream in a solvent and form a liquid ethylene monomer, and supplying a feed stream including the liquid ethylene monomer as a discharge stream to a reactor, thereby removing heat of dissolution of the gaseous ethylene monomer outside of the reactor, and decreasing an amount of a refrigerant used in an alpha-olefin production process to improve economic feasibility.