10 results about "Isotropic pitch" patented technology

The present application relates to a preparation process of isotropic pitch and high softening point coating pitch, which uses aromatic oil as raw material oil, and bio-tar or / and bio-pitch as co-carbonization agent. The pre-polymer material is obtained by pre-polymerization reaction of the bottom into the pre-polymerization reactor under the induction of oxygen-containing linear polymer. The photosensitive oxidation crosslinking agent is added to the pre-polymer material, the material distribution tray in the middle of the oxidation crosslinking reaction tower is fed, and the oxidation crosslinking gas enters from the lower part of the crosslinking reaction tower through the gas distributor. The obtained crosslinking pitch product is discharged from the bottom of the reaction tower. The crosslinking pitch then enters the middle of the polymerization reactor, and the polycondensation reaction occurs under the induction of high-energy electron beam irradiation. The polycondensation pitch product is obtained from the lower part of the polymerization reactor. The polycondensation pitch product enters the upper part of the extraction separation tower, and the sub / supercritical solvent enters the lower part of the extraction separation tower. The two-phase countercurrent contact extraction separation is carried out, and the isotropic pitch and high softening point coating pitch are obtained after the extraction solvent is separated.

The present application relates to a preparation method of isotropic pitch for coating and spinning, which uses ethylene tar, catalytic cracking slurry, medium-low temperature coal tar, bio-tar and other aromatic-rich heavy oil as raw material, carries out hydrogenation stabilization and isomerization modification on the raw material by adopting ebullated bed reaction form, obtains pre-polymerized pitch under the induced polymerization of oxygen-containing linear polymer in the ebullated bed hydrogenation tail oil, carries out oxidation cross-linking reaction under the action of plasma radiation, further improves the softening point and carbon residue value of the obtained isotropic pitch product, and inhibits the generation of mesophase optical structure, and the molecular weight distribution of the isotropic pitch product is relatively concentrated, which exhibits excellent coating performance and homogeneous melting and spinning performance.

A process for producing mesophase pitch includes charging a mixture of a carrier gas and a hydrocarbon feed including isotropic pitch to a reactor operating at thermal operating conditions sufficient to induce conversion of at least one chosen from the hydrocarbon feed and the isotropic pitch to mesophase pitch such that the mixture of the hydrocarbon feed and the carrier gas establishes a stratified flow regime having a vapor phase and a liquid phase in the reactor. The process also includes maintaining thermal operating conditions in the reactor while the mixture of the hydrocarbon feed and the carrier gas is flowing in the stratified flow regime in the reactor such that conversion of the at least one chosen from the hydrocarbon feed and the isotropic pitch to mesophase pitch is induced in the liquid phase. The process further includes discharging an effluent including mesophase pitch from the reactor.

The present application relates to a kind of isotropic pitch of excellent spinning performance and its preparation method and application, belong to pitch technical field.The preparation method of isotropic pitch-based carbon fiber in prior art is relatively complex, the equipment requirement is high, the cost is high, and the spinning performance is poor, etc.The preparation method of the present application, first, aromatic-rich heavy oil is used as raw material, polyaldehyde oxygen-containing polymer is used as co-carbonization reagent, and low polycondensation product with different molecular weights is prepared by co-carbonization reaction;Then, using supercritical / subcritical extraction process, different extractants with different solubility parameters are used to extract low polycondensation product, to obtain the residue containing dimmer with molecular weight of 330-450;Finally, the residue is distilled, and the extractant is recovered, and the obtained dimmer is subjected to thermal polycondensation treatment by fluidized bed tubular reactor, and combined with flow control, to obtain isotropic pitch.The spinning performance of the isotropic pitch is excellent, and the carbon fiber with excellent mechanical properties can be prepared.

Methods, systems, and compositions involving forming isotropic pitch by reacting an aromatic hydrocarbon feed and a linker in the presence of a catalyst, and forming mesophase pitch by heating the isotropic pitch.

A system (1000) for producing mesophase coke from isotropic pitch is disclosed. The system comprises a reactor having a first heating zone (102) to pre-treat isotropic pitch by operating at a temperature of 250-350°C at atmospheric pressure. The reactor further comprises a second heating zone (103) to heat the pre-treated isotropic pitch to obtain mesophase pitch by maintaining a temperature of 350-500°C at atmospheric pressure. The reactor comprises a third heating zone (104) to heat the mesophase pitch to obtain mesophase coke by maintaining a temperature of 500-800°C at atmospheric pressure. The system further comprises a pusher unit (300) adapted to physically move a container (50) from an inlet zone (101) to an outlet zone (106) to obtain mesophase coke.

The invention relates to a production method for improving quality and quantity of modified asphalt, which takes medium-temperature asphalt as a raw material, air or nitrogen is used for carrying out gas stripping treatment on the asphalt raw material, group component and softening point adjustment is rapidly carried out on an asphalt system at low temperature, the subsequent reaction time is shortened, the productivity of the modified asphalt is improved, and compared with the productivity of the modified asphalt produced by a conventional thermal polymerization method, the productivity of the modified asphalt can be improved by 20-30%. And the polymerization reaction temperature of the mesophase anisotropic pitch is reduced, and the purpose of saving energy is achieved. The quinoline insolubles (QI) and the coking value of the obtained isotropic asphalt are improved. The obtained mesophase anisotropic asphalt is low in mesophase content and can be used for preparing asphalt with high mesophase and low softening point.

A process for producing mesophase pitch, the process including: contacting an isotropic pitch with a solvent under conditions sufficient to produce a solvent fraction comprising the solvent and an insoluble fraction comprising mesophase pitch; and recovering the mesophase pitch, wherein the contacting includes the solvent having a Solubility Blending number (SBN) that causes the mesophase pitch to have a softening point ranging from 270° C. to 350° C., as measured in accordance with ASTM D3104-14.

A process for producing mesophase pitch includes charging a mixture of a carrier gas and a hydrocarbon feed including isotropic pitch to a reactor operating at thermal operating conditions sufficient to induce conversion of at least one chosen from the hydrocarbon feed and the isotropic pitch to mesophase pitch such that the mixture of the hydrocarbon feed and the carrier gas establishes a stratified flow regime having a vapor phase and a liquid phase in the reactor. The process also includes maintaining thermal operating conditions in the reactor while the mixture of the hydrocarbon feed and the carrier gas is flowing in the stratified flow regime in the reactor such that conversion of the at least one chosen from the hydrocarbon feed and the isotropic pitch to mesophase pitch is induced in the liquid phase. The process further includes discharging an effluent including mesophase pitch from the reactor.

A method for preparing mesophase bitumen is described. The method typically includes providing feedstocks of T5 having a temperature ≥400°F (204°C) and T95 having a temperature ≤1,400°F (760°C), and heating the feedstocks at a temperature ranging from about 420°C to about 520°C to prepare a heat-treated product comprising isotropic bitumen. Typically, the heating is carried out under conditions sufficient to satisfy the relationship [X*Y] ≥ 20,000 seconds, where X is the equivalent reaction time of the heating, and Y is the bromine value of the feedstock as measured according to ASTM D1159. The method typically further includes mixing the isotropic bitumen with a mixture solubility value (S... BN The solvent of at least about 10 SU is contacted under conditions sufficient to prepare a solvent fraction containing the solvent and an insoluble fraction containing the mesophase pitch; and the mesophase pitch is recovered.