Maruzen process

Mar tius Yellow Maruzen process Mascaras Masers Mashing... 

Mid-Century Also called M-C. A process for oxidizing p-xylene to terephthalic acid, using oxygen in acetic acid and catalyzed by a mixture of cobalt and manganese bromides. Developed in the 1950s by Halcon International and commercialized by Standard Oil Company (Indiana). The first plant was built at Jolet, IA, in 1938. The Amoco and Maruzen processes are improved versions. 

Maruzen process for xylenes [XYLENES AND ETHYLBENZENE] (Supplement)... 

The Maruzen process uses ethylene gas as a direct refrigerant in a two-stage process (77,78). The first stage slurry is centrifuged, partially remelted, and fed to the second centrifuge. 

Tables 4.16 a, b and 4.16 c provide some economic data on the isomerization processes employing noble metal base catalysts, and on techniques operating in the absence of hydrogen, including the Maruzen process in particular, for which only data concerning the crystallization/isomerization unit are usually available.

Other crystallization methods for producing p-xylene include the Maruzen process, which uses ethylene as a direct coolant, the Arco process, which is very similar to the Amoco process, and the three-stage Kmpp-Koppers process. 

Amoco Amoco Chemicals Company, a subsidiary of Amoco Corporation, formerly Standard Oil Company (IN), is best known in the chemicals industry for its modification of the Mid-Century process for making pure terephthalic acid. /7-Xylene in acetic acid solution is oxidized with air at high temperature and pressure. Small amounts of manganese, cobalt, and bromide are used as catalysts. The modification allows the use of terephthalic acid, rather than dimethyl terephthalate, for making fiber. The process can also be used for oxidizing other methylbenzenes and methylnaphthalenes to aromatic carboxylic acids. See also Maruzen. 

Maruzen (1) A process for making terephthalic acid from/j-. ylcnc. Similar to the Amoco process but yielding a purer product in one stage. Operated in Japan by Matsuyama Chemical Company. 

Maruzen (2) A process for purifying p-xylene by crystallization, using ethylene as the direct coolant. Developed by Maruzen Gas Oil Company, United States. Now probably superseded by the Parex (1) process. 

XIS [Xylene isomerization] A process for isomerizing /j-xylcne to the equilibrium mixture of C8 aromatic hydrocarbons. Developed by Maruzen Oil in the United States. 

Amorphous Silica—Alumina Based Processes. Amorphous silica—alumina catalysts had been used for many years for xylene isomerization. Examples are the Chevron (130), Maruzen (131), and ICI (132—135). The primary advantage of these processes was their simplicity. No hydrogen was required and the only side reaction of significance was disproportionation. However, in the absence of H2, catalyst deactivation via coking... 

Equistar Chemicals L. D. Polyethylene, Bimodal HDPE Ethylene Equistar-Maruzen low-pressure sluury process producees bimodal HDPE resins for film, blow molding, pipe and injection molding 3 1985... 

Hie first commerdal fadlities were built on techniques developed by Oronite (now Chevron) and Humble-Oil Subsequently, the best known processes were those of Oiemm, Phillips, which is no longer commerdalized, Amoco, Esso, known by the designatioa of Isohning, and Antar HRI Hydrocarbon Research Inc.). The latest have been proposed by Krupp, Maruzen and ARCO Atlantic Ricftfteld Ca.). 

Various processes have been devdoped by Chevron, ShelL Sinclair, Southern Petro-chemical, etc., and particularly by ICJ Imperial Chemical Industries Maruzen (XIS processX which operates in the presence of steam at a ratio of 0.05 to 0.15 mol/mol of xylenes feedstock, and ARCO, which proposes the permanent regeneration of its catalyst by using the moving bed technology. These processes are usually combined with a p-xylcne recovery technique, generally by crystaDizatioa The isomerization yield depends on the ethylbenzene content at the reactor inlet and on the desired target product, either p-xylene alone or o- and p-xylenes simultaneously.. . ... 

At 5NPE Group, we developed processes suitable for the manufacture of either BOC-oxystyrene from 4-ace-toxystyrene and BOC-F or directly poly (BOC-oxystyrene) through reaction of BOC-F with poly (4-vinyl phenol), MARUKA Lyncur M from MARUZEN Petro-chemical Co. Ltd. As shown in scheme 74, these processes are quite simple and afford good yields (Ref. 99). 

The value of 2-butanol t ii° = 0 08, >,bpuol3 99.5 C) resides in the fact that 90 per cent of its total production is used for the synthesis of MEK. (methylethyiketone) by dehydrogenation. It is manufactured by the indirect hydration of n-butenes. of which the 1- and 2-isomers yield the same 2-butanoL They are absorbed in 80 per cent weight sulfuric acid, between 15 and 20 C, and 0.7.10 Pa absolute. The salfuric esters obtained are then hydrolysed between 25 and 35°C at 0.1.10 Pa absolute, with 65 to 75 per cent weight sulfuric add (Exxon. Maruzen and Shell processes). Despite considerable research work (Deutsche Texaco. Mitsubishi. Mitsui, Petrotex and Shell), the direct catalytic hydration of H-butenes has not yet reached the industrial stage. 

The Maruzen Oil process operates in similar conditions to those of the Amoco process,... 

In the group of suspension processes, there are the jacket cooled and the directly (e.g., by inert gases) cooled processes. The Amoco process, on the one hand, and the Maruzen or Chevron process, on the other hand, are, according to Ransley (1984), representatives for such processes. Other developments are scrapes crystallizers according to the Humble-Oil, the Krupp-Harpen (see Ritzer 1973), or the Hoechst AG (DE-PS 1969) process which are used for the production of p-nitrochlorobenzene. These scraped surface crystallizers are in fact solid layer processes, but in the handling of the products—crystals in suspension—they have to be treated like suspension processes. A number of processes that feature a combination of a scraped crystallizer and suspension techniques will be discussed. 

The Japanese company Maruzen Oil Co. [50] and Catalytica Associates Co. [51] use ferric sulfate as oxidant (cocatalyst) [52] (also compare [2]) Catalytica claims a commercial process in existing Wacker two-stage plants. 

Hasegawa, H. and Triuchijima, M. (1971) Process for the Production of Methyl Ethyl Ketone from n-Butene, Maruzen Oil Co. (1971) Patent GB 1.240.889. 

There are several competing hexane slurry processes, but only Basell (Hostalen process) and Equistar-Maruzen still have active licensing activities. Both processes use similar reactor configuration and operating conditions. 

Maruzen (3) A process for making methyl ethyl ketone by the direct oxidation of -butane, catalyzed by palladium and ferric snlfate. Not commercialized. 

---