公开(公告)号：EP1092059A1

公开(公告)日：2001-04-18

申请号：EP99955306.8

申请日：1999-05-28

Applicant: U.S. BORAX INC.

Inventor： BAIR, Charles, M. ,  MCBROOM, Robert, B. ,  TRAN, Honghi, N.

IPC: D21C11/00 ,  D21C11/04

CPC classification number: D21C11/0078 ,  D21C3/02 ,  Y02P40/44

Abstract: A method is provided for the use of borates in the recausticization of alkali-containing liquors such as those produced in the chemical and semi-chemical pulping of wood and in the oxidation and bleaching of wood pulp. Sodium hydroxide is regenerated from sodium carbonate-containing smelts in such pulp processes by autocausticization through the addition of limited amounts of borate. Autocausticization may be carried out at boron to carbonate molar ratios below 2:1 and at sodium to boron molar ratios exceeding 3:1, resulting in high reaction efficiency. Partial autocausticization using borate may also be combined with conventional lime recausticization for the regeneration of sodium hydroxide from sodium carbonate-containing smelts.

公开(公告)号：EP1092059B1

公开(公告)日：2007-06-06

申请号：EP99955306.8

申请日：1999-05-28

Applicant: U.S. BORAX INC.

Inventor： BAIR, Charles, M. ,  MCBROOM, Robert, B. ,  TRAN, Honghi, N.

IPC: D21C11/00 ,  D21C11/04

CPC classification number: D21C11/0078 ,  D21C3/02 ,  Y02P40/44

Abstract: A method is provided for the use of borates in the recausticization of alkali-containing liquors such as those produced in the chemical and semi-chemical pulping of wood and in the oxidation and bleaching of wood pulp. Sodium hydroxide is regenerated from sodium carbonate-containing smelts in such pulp processes by autocausticization through the addition of limited amounts of borate. Autocausticization may be carried out at boron to carbonate molar ratios below 2:1 and at sodium to boron molar ratios exceeding 3:1, resulting in high reaction efficiency. Partial autocausticization using borate may also be combined with conventional lime recausticization for the regeneration of sodium hydroxide from sodium carbonate-containing smelts.

Abstract translation: 本发明提供了硼酸盐在含碱液体的再苛化方面的应用，例如在木材的化学和半化学制浆以及木浆的氧化和漂白中制备的含碱液体。 氢氧化钠通过添加有限量的硼酸盐，通过自动碱化在含有碳酸钠的熔融物中再生。 当硼与碳酸盐的摩尔比低于2：1并且钠与硼的摩尔比超过3：1时，可进行自动碱化，导致高反应效率。 使用硼酸盐的部分自动化也可以与传统的石灰再苛化相结合，以由含碳酸钠的熔炼物再生氢氧化钠。

公开(公告)号：EP1090181B1

公开(公告)日：2006-12-20

申请号：EP99927121.6

申请日：1999-05-28

Applicant: U.S. BORAX INC.

Inventor： TRAN, Honghi, N. ,  BAIR, Charles, M. ,  McBROOM, Robert, B.

IPC: D21C11/00 ,  D21C11/04

CPC classification number: D21C3/02 ,  D21C11/0078 ,  Y02P40/44

Abstract: Method and improving causticizing efficiency in the conventional lime recausticization portion of alkaline pulping processes, such as are commonly used in the pulping and bleaching of wood and non-wood cellulose fiber materials. An aqueous solution of sodium carbonate is reacted with lime to produce sodium hydroxide (causticization) in the presence of borate to improve the causticization reaction efficiency. Borate is provided in an amount sufficient to maintain a boron to sodium molar ratio in the range of between about 0.001:1 and 0.4:1, resulting in an increased causticization efficiency. An added benefit is reduction of inorganic deadload in the pulping circuit.

公开(公告)号：EP1090181A1

公开(公告)日：2001-04-11

申请号：EP99927121.6

申请日：1999-05-28

Applicant: U.S. BORAX INC.

Inventor： TRAN, Honghi, N. ,  BAIR, Charles, M. ,  McBROOM, Robert, B.

IPC: D21C11/00 ,  D21C11/04

CPC classification number: D21C3/02 ,  D21C11/0078 ,  Y02P40/44

Abstract: Method and improving causticizing efficiency in the conventional lime recausticization portion of alkaline pulping processes, such as are commonly used in the pulping and bleaching of wood and non-wood cellulose fiber materials. An aqueous solution of sodium carbonate is reacted with lime to produce sodium hydroxide (causticization) in the presence of borate to improve the causticization reaction efficiency. Borate is provided in an amount sufficient to maintain a boron to sodium molar ratio in the range of between about 0.001:1 and 0.4:1, resulting in an increased causticization efficiency. An added benefit is reduction of inorganic deadload in the pulping circuit.

Abstract translation: 碱法制浆工艺的常规石灰再苛化部分中的方法和提高苛化效率，例如常用于木材和非木材纤维素纤维材料的制浆和漂白。 碳酸钠水溶液与石灰反应以在硼酸盐存在下产生氢氧化钠（苛化）以提高苛化反应效率。 提供硼酸盐的量足以使硼与钠的摩尔比保持在约0.001:1至0.4:1的范围内，导致苛化效率提高。 另一个好处是减少了制浆回路中的无机自重。