公开(公告)号：US4239913A

公开(公告)日：1980-12-16

申请号：US933902

申请日：1978-08-15

Applicant: Ryuzo Ueno ,  Hiroaki Tsuchiya ,  Yasukazu Muramoto ,  Yoshihiko Kuwae

Inventor： Ryuzo Ueno ,  Hiroaki Tsuchiya ,  Yasukazu Muramoto ,  Yoshihiko Kuwae

IPC: C07C51/15

CPC classification number: C07C51/15

Abstract: A process for preparing 2-hydroxynaphthalenecarboxylic acids which comprises reacting a liquid mixture of 1 mole of an alkali .beta.-naphtholate, 0.05 to 3 moles of .beta.-naphthol, and 0.1 to 5 times the weight of the alkali .beta.-naphtholate of light oil or kerosene with carbon dioxide under a carbon dioxide pressure of not more than 15 kg/cm.sup.2.G at a temperature of at least 180.degree. C.

Abstract translation: 一种制备2-羟基萘甲酸的方法，其包括使1摩尔碱式β-萘酚的0.05摩尔β-萘酚的液体混合物与轻油碱性β-萘磺酸盐的重量的0.1至5倍反应，或 在二氧化碳压力为不超过15kg / cm 2·G的二氧化碳的煤油中，在至少180℃的温度下

公开(公告)号：US4966992A

公开(公告)日：1990-10-30

申请号：US298135

申请日：1989-01-18

Applicant: Ryuzo Ueno ,  Yoshiyasu Masada ,  Yoshihiko Kuwae ,  Keiji Kawata

Inventor： Ryuzo Ueno ,  Yoshiyasu Masada ,  Yoshihiko Kuwae ,  Keiji Kawata

IPC: C07C65/03 ,  C07C51/15 ,  C07C51/42 ,  C07C65/11

CPC classification number: C07C51/15

Abstract: The present invention provides a method of production of aromatic hydroxycarboxylic acids by the reaction of alkaline metal salts of phenols or naphthols with carbon dioxide, in which free phenols or free naphthols produced as by-products in the reaction system are removed from the system so as to control the content of free phenols or free naphthols at a suitable level, by which a purer objective compound can be obtained at high yield under the condition of lower temperature and shorter time.