摘要:
A process for the production of acetic acid by carbonylating methanol and/or a reactive derivative thereof in a carbonylation reactor in a liquid reaction composition comprising an iridium carbonylation catalyst, methyl iodide, methyl acetate, water, acetic acid and at least one promoter selected from the group consisting of ruthenium, rhenium and osmium, characterized in that there is also present in the reaction composition a bis-phosphonate compound having the formula (I): wherein R1, R2, R3, R4 are independently hydrogen or an organic functional group; Y is an optionally substituted C1-C10 alkylene or C6-C10 aryl group.
摘要:
The invention relates to an adjustable keyboard to be used, for example, at a computer terminal (12). The preferred embodiment is in the form of a keyboard having a number of keys (5), the keyboard being formed in at least two segments (2, 3) which are mutually movable relative- to one another using a hinge or joint (6). Each of the segments (2, 3) of the keyboard has mounted thereon some of the keys (5). The relatively movable nature of the keyboard aims at reducing stress and discomfort to the user by eliminating contortion to the user's wrists. More particularly, discomfort to the user caused by pronation of the wrists and/or ulnar deviation of the wrists is reduced. The hinge or joint (6) may be in the form of a ball and socket-type joint with a locking mechanism, which preferably includes a pivoted handle (100), in the form of a lever, used for locking and unlocking the hinge or joint (6).
摘要:
A detector for determining which interface protocol is in use by a serialiser/deserialiser, and comprising detecting channels composed of clocked delays and bit comparators for detecting the presence of idle signals coded according to either ten-bit or five-bit protocols using either one or two clocks.
摘要:
An adjustable support for a data input device and the like including a base attached to an associated worksurface, a platform shaped to support the data input device thereon and having a front portion and a rearward portion, and a support arm having one end pivotally joined with the base, and an opposite end pivotally joined to the rearward portion of the platform. Also included is a locking member fixed to the support arm, and an elongate brake element wrapped around the locking member, and having one end coupled to the base and a second end connected with the platform at a point spaced from the opposite end of the arm such that rotation of the tray about the coupling at the second end of the support arm releases the brake element and permits changes in the elevation of the support with respect to the base, and the moment of the platform and any associated input device tenses the braking element against the locking member and locks the platform in its selected position.
摘要:
Crystalline zeolites having a FER framework type wherein the crystallites have a dimension in the c-axis of about 500 nanometres (nm) or less, a method for their preparation and a process for the co-production of acetic acid and dimethyl ether comprising the step of contacting methyl acetate and methanol in the presence of catalysts comprising the crystalline zeolites.
摘要:
Process for the production of methyl acetate by carbonylating a dimethyl ether feed with carbon monoxide under substantially anhydrous conditions, in the presence of a zeolite catalyst effective for the carbonylation. The carbonylation is carried out at a temperature in the range of 275 to 350° C. and in the presence of hydrogen.
摘要:
Process for the production of methyl acetate by carbonylating a dimethyl ether feed with carbon monoxide in the presence of hydrogen under substantially anhydrous conditions, at a temperature in the range of greater than 250° C. to 350° C. and in the presence of a zeolite catalyst effective for said carbonylation. The concentration of dimethyl ether is at least 1 mol % based on the total feed.
摘要:
A process for the production of acetic acid by the liquid phase carbonylation of an alcohol and/or a reactive derivative thereof in which there is employed a catalyst comprising a complex of rhodium or iridium with a pincer ligand.
摘要:
Cases for enclosing and remaining attached to a mobile communications device may include a semi-rigid shell and a fabric covering attached thereto. The cases may include a semi-rigid shell with a recessed portion for accepting a fabric covering and the fabric covering.
摘要:
A process for producing triptane and/or triptene from methanol and/or one or more derivatives thereof, and optionally one or more further alcohols and/or derivatives thereof at a temperature in the range of from 150 to 400° C., in the presence of a zeolite catalyst having Brønsted acidity, in which all the carbon atoms in the triptane and/or triptene are derived from the methanol and/or one or more derivatives thereof and the optional further alcohols and/or derivatives thereof, the zeolite catalyst being selected from: i. zeolites having frameworks comprising silicon and aluminium atoms at a Si:Al mole ratio of greater than (2), which zeolites also have a channel structure comprising a ring size of (12) or more non-oxygen atoms in (2) or (3) dimensions; and ii. zeolites having frameworks comprising silicon and aluminium atoms, and which have a framework ring comprising (12) or more non-oxygen-atoms accessible on the external surface of the zeolite and a pore structure in which all of the channels have a ring-size of less than (12) non-oxygen atoms. There is also described a process for producing triptane and/or triptene wherein the zeolite catalyst is zeolite X, the reaction composition additionally comprises a C3 alcohol and/or one or more derivatives thereof, in which the mole ratio of C3 alcohol:methanol present in the reaction composition, or derivable from the one or more derivatives thereof present in the reaction composition, is greater than 0.23:10, and the temperature of the process is in the range of greater than 200° to 400° C.