Method for preventing polymerization in thin-film type evaporating device
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IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B01D-001/22
B01D-003/34
C07C-051/44
출원번호
US-0556754
(2000-04-21)
우선권정보
JP-0116991 (1999-04-23)
발명자
/ 주소
Ijiri, Yuichi
Nishimura, Takeshi
Matsumoto, Yukihiro
출원인 / 주소
Nippon Shokubai Co., Ltd.
대리인 / 주소
Mathews, Collins, Shepherd & McKay, P.A.
인용정보
피인용 횟수 :
7인용 특허 :
12
초록▼
A method is provided for preventing an easily polymerizable substance from being polymerized in a thin-film type evaporating device by supplying a solution of the substance to the evaporating heating surface of the device by the centrifugal force of a stirring rotary shaft, characterized by mixing a
A method is provided for preventing an easily polymerizable substance from being polymerized in a thin-film type evaporating device by supplying a solution of the substance to the evaporating heating surface of the device by the centrifugal force of a stirring rotary shaft, characterized by mixing a distilled vapor of the substance with a molecular oxygen-containing gas and supplying the extracted liquid or a solution having lower viscosity than the extracted liquid to a feed raw material inlet thereby adjusting the quantity of a wetting liquid per unit length of the surface in the range of 0.02-2 m3/mHr. In the evaporation of the substance by the use of the device, a method for preventing the substance from polymerization is provided.
대표청구항▼
A method is provided for preventing an easily polymerizable substance from being polymerized in a thin-film type evaporating device by supplying a solution of the substance to the evaporating heating surface of the device by the centrifugal force of a stirring rotary shaft, characterized by mixing a
A method is provided for preventing an easily polymerizable substance from being polymerized in a thin-film type evaporating device by supplying a solution of the substance to the evaporating heating surface of the device by the centrifugal force of a stirring rotary shaft, characterized by mixing a distilled vapor of the substance with a molecular oxygen-containing gas and supplying the extracted liquid or a solution having lower viscosity than the extracted liquid to a feed raw material inlet thereby adjusting the quantity of a wetting liquid per unit length of the surface in the range of 0.02-2 m3/mHr. In the evaporation of the substance by the use of the device, a method for preventing the substance from polymerization is provided. p wherein the length weighted curl index of the treated fiber is at least about 20% higher than the length weighted curl index of the fiber prior to the non-destructive heat treatment, bleaching and convolving thereof. 2. The process according to claim 1, wherein said step of concurrently heat-treating and convolving said fiber is carried out in a chamber in the presence of saturated steam. 3. The process according to claim 2, wherein the pressure in said chamber is pulsed with respect to time. 4. The process according to claim 3, wherein the localized pressure within the chamber is pulsed with respect to time. 5. The process according to claim 4, wherein said step of concurrently heat-treating and convolving said fiber is carried out in a disk refiner provided with a rotating disk having a relief pattern operative to impart localized pressure pulses within the chamber. 6. The method according to claim 5, wherein a gap between a disk of said disk refiner and an opposing surface is from about 0.5 mm to about 10 mm. 7. The method according to claim 6, wherein a gap between a disk of said disk refiner and an opposing surface is from about 1 mm to about 5 mm. 8. The process according to claim 1, wherein the at least 20% elevation in the length weighted curl index of the treated fiber persists upon treatment in a disintegrator for 30 minutes at 1% consistency and a temperature of 125° F. 9. The process according to claim 1, wherein said pulp exhibits a drop in CSF of at most about 60 ml by way of said process. 10. The process according to claim 9, wherein said pulp exhibits a drop in CSF of at most about 45 ml by way of said process. 11. The process according to claim 10, wherein said pulp exhibits a drop in CSF of at most about 30 ml by way of said process. 12. The process according to claim 1, wherein said pulp exhibits essentially no drop in CSF and optionally exhibits an increase in CSF. 13. The process according to claim 1, wherein said pulp comprises a mixture of virgin fiber and secondary fiber comprising from about 5% to about 95% by weight of secondary fiber based on the weight of fiber present in the pulp. 14. The process according to claim 1, wherein the curl index of the treated fiber is at least about 30% higher than the curl index of the fiber prior to said step of concurrently heat-treating and convolving said fiber. 15. The process according to claim 14, wherein the curl index of the treated fiber is reduced by at most about 25% by treatment at 1% consistency at 125° F. in a disintegrator for 30 minutes. 16. The process according to claim 14, wherein the curl index of the treated fiber is reduced by at most about 15% by treatment at 1% consistency at 125° F. in a disintegrator for 30 minutes. 17. The process according to claim 14, wherein the curl index of the treated fiber is at least about 40% higher than the curl index of the fiber prior to heat-treating and convolving said fiber. 18. The process according to claim 1, wherein the curl index of the treated fiber is at least about 50% higher than the curl index of the fiber prior to heat-treating and convolving said fiber. 19. The process according to claim 1, wherein the treated fiber has a length-weighted curl index of at least about 0.12. 20. The process according to claim 19, wherein said treated fiber has a length-weighted curl index of at least about 0.15. 21. The process according to claim 20, wherein the treated fiber has a length-weighted curl index of at least about 0.2. 22. The process according to claim 21, wherein said treated fiber has a length-weighted curl index of at least about 0.25. 23. The process according to claim 22, wherein said treated fiber has a length-weighted curl index of at least about 0.3. 24. The process according to claim 1, wherein said step of heat-treating and convolving said fiber is carried out at a consistency of from about 20% to about 60%. 25. The process according to claim 24, wherein said step of heat-treating and co nvolving said fiber is carried out at a consistency of from about 20% to about 50%. 26. The process according to claim 25, wherein said step of heat-treating and convolving said fiber is carried out at a consistency of from about 30% to about 40%. 27. The process according to claim 1, wherein said step of heat-treating and convolving said fiber has a duration of from about 0.01 to about 20 seconds. 28. The process according to claim 27, wherein said step of heat-treating and convolving said fiber has a duration of less than about 10 seconds. 29. The process according to claim 28, wherein said step of heat-treating and convolving said fiber has a duration of less than about 5 seconds. 30. The process according to claim 29, wherein said step of heat-treating and convolving said fiber has a duration of less than about 2 seconds. 31. The process according to claim 1, wherein said step of heat-treating and convolving said fiber is carried out at a temperature of from about 230° F. to about 370° F. 32. The process according to claim 1, wherein mechanical energy input to said fiber during said heat-treating and convolving step is less than about 2 HP day/ton. 33. The process according to claim 32, wherein the mechanical energy input to said fiber during said heat-treating and convolving is less than about 1 HP day/ton. 34. The process according to claim 33, wherein mechanical energy input to said fiber during said heat-treating and convolving step is less than about 0.5 HP day/ton. 35. The process according to claim 1, wherein said step of heat-treating and convolving is carried out at a pressure of from about 5 to about 150 psig. 36. The process according to claim 35, wherein said step of heat-treating and convolving is carried out at a pressure of from about 10 to about 90 psig. 37. The method according to claim 1, wherein said step for heat-treating and convolving said fiber is carried out in the presence of papermaking chemicals, one or more of which chemicals is selected from the group consisting of sulfates, silicates, hydroxides, peroxides and debonders. 38. The method according to claim 1, wherein said step of heat-treating and convolivng said fiber is carried out in the presence of an alkaline agent and a peroxide bleach. 39. The process according to claim 1, wherein said fiber comprises secondary fiber. 40. The process according to claim 1, wherein said fiber consists essentially of secondary fiber. 41. The process according to claim 1, wherein said fiber consists of secondary fiber. 42. The process according to claim 1, wherein said Kraft fiber is selected from the group consisting of Kraft hardwood fibers, Kraft softwood fibers, and mixtures thereof. 43. The process according to claim 1, wherein the pulp consists of Kraft fibers. 44. The process according to claim 43, wherein said Kraft fibers are selected from the group consisting of Kraft softwood fibers, Kraft hardwood fibers and mixtures thereof. 45. The process according to claim 43, wherein said Kraft fibers are Kraft softwood fibers. 46. A method for producing a bleached, high bulk cellulosic fiber exhibiting a durable elevated curl index comprising: (a) feeding a cellulosic pulp including Kraft fiber to a refining gap defined between opposed surfaces, at least one of the surfaces being rotatable with respect to its opposed surface; (b) concurrently heat-treating and convolving the cellulosic pulp including Kraft fiber in the refining gap at high consistency with a peroxide bleaching liquor comprising a peroxide component wherein said step is carried out at elevated temperature and pressure under conditions selected so as to preclude substantial fibrillation and attendant paper strength and fiber bonding development; and (c) recovering said fiber wherein the curl index of the treated fiber is at least about 20% higher than the curl index of the fiber prior to non-destructive refining and the elevation of the curl index so attained persists for at least 30 mi
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