摘要:
Disclosed herein is a process of producing high purity and high yield dimethylnaphthalene by dehydrogenating a dimethyltetralin isomer using a metal catalyst for dehydrogenation. The metal catalyst contains a carrier selected from alumina (Al2O3), silica (SiO2), a silica-alumina mixture and zeolite. The metal catalyst also contains 0.05 to 2.5% by weight of platinum (Pt), 0.1 to 3.0% by weight of tin (Sn) or indium (In), 0.5 to 15.0% by weight of at least one selected from the group consisting of potassium (K), magnesium (Mg) and cesium (Cs), 0.3 to 3.0% by weight of chlorine, and 0.01 to 3.0 % by weight of zinc (Zn) or gallium (Ga) as active components based on an element weight of the final catalyst.
摘要翻译:本文公开了通过使用用于脱氢的金属催化剂使二甲基四氢萘异构体脱氢来生产高纯度和高收率的二甲基萘的方法。 金属催化剂含有选自氧化铝(Al 2 O 3 O 3),二氧化硅(SiO 2/2),二氧化硅 - 氧化铝混合物和沸石 。 金属催化剂还含有0.05〜2.5重量%的铂(Pt),0.1〜3.0重量%的锡(Sn)或铟(In),0.5〜15.0重量%的选自以下的至少一种: 钾(K),镁(Mg)和铯(Cs),0.3〜3.0重量%的氯和0.01〜3.0重量%的作为活性成分的锌(Zn)或镓(Ga) 最终催化剂。
摘要:
A method for producing naphthalenedicarboxylic acid comprising the steps of: dissolving 2,6-dimethylnaphthalene in acetic acid solvent; oxidizing the product from the dissolution process using oxygen and a diluent gas; crystallizing naphthalenedicarboxylic acid that has been produced from the oxidation process; and separating the crystallized naphthalenedicarboxylic acid, wherein the amount of the diluent gas being discharged from and recycled to the oxidation process is controlled during the oxidation process, and the amount of mother liquor being recycled to the dissolution process after crystallization is controlled during the separation process, is provided.
摘要:
The present invention relates to a high strength polyethylene-2,6-naphthalate fiber produced by a method comprising controlling the stress-strain curve and fine structure of an undrawn yarn such that the drawability of the undrawn yarn in a drawing step is improved. The industrial polyethylene-2,6-naphthalate fiber with high strength according to the present invention shows high strength and low shrinkage, and a treated cord formed from this fiber has improved dimensional stability and high strength, such that it can be advantageously employed as a fibrous reinforcement material of rubber products such as tires.
摘要:
This invention relates to a poly(trimethylene terephthalate) BCF carpet yarn having a Y-shaped cross-section that has an modification ratio and a arm angle within a specific range, and a method for preparing it. The BCF carpet yarn has excellent bulk property and spinning efficiency, and a carpet made from it has good appearance, sense of touch, and tufting efficiency.
摘要:
A multi-channel charging system includes a power source supplying power, a transformer connected to the power source, a plurality of charging ports connected to the transformer and charging or discharging each object, a converter converting power between the power source and the transformer or between the object and the transformer, and a controller controlling the converter or each of the objects, wherein the controller transmits/receives a signal to or from each of the objects, controls power transmission/reception between each of the objects, or controls power transmission/reception between the power source and the objects.
摘要:
Proposed is a method for accurately predicting an overcurrent flowing inside an isolated bidirectional DC-DC converter even without using a current sensor on primary and secondary sides of a transformer. In the converter according to the present disclosure, an average value of the inductor current is calculated after deriving inflection point current values by respectively modeling a current waveform for an inductor current of the transformer. A secondary side output current average value is calculated by comparing the calculated average value of the inductor current with a secondary side capacitor current average value of the converter at no load. Next, an error between the secondary side output current average value and an actually measured secondary side output current is calculated, and the inflection point current values of the current waveform are updated using a gain for reducing the error through PI control, whereby the overcurrent may be predicted.
摘要:
The present invention relates to a ballistic cloth using a unidirectional aramid sheet and a polyethylene film and a method for manufacturing the same and, more particularly, is characterized in that aramid multifilament layers, which have monofilaments stacked and arranged in one direction, are arranged perpendicularly, a polyethylene film, which plays both the role of a binder and the role of protecting the sheet surface, is arranged between the aramid multifilament layers to manufacture a ply, and the ply is inserted into a mold and undergoes a pressing process and a cooling process, thereby manufacturing a ballistic cloth. A ballistic cloth manufactured by the method according to the present invention is advantageous in that use of a polyethylene film having a low softening point between unidirectional aramid sheets improves adhesiveness between the sheets and also improves the slip factor when the same ply is stacked, thereby exhibiting excellent ballistics performance. In addition, since the binder is solely made of a film, odor-free, environment-friendly manufacturing processes can be employed, no freezing is needed during storage; improved flexibility of the sheet facilitates delivery and distribution of impacts of bullets when the ballistic cloth is worn, thereby improving the ballistics performance and making the ballistic cloth further lightweight; and the polyethylene film, which is the protective layer of the unidirectional aramid sheets, has an adhesive strength of at least 2 kgf, thereby improving the ballistics performance.
摘要:
A shorting device for facilitating the grounding of a converter to which a plurality of sub modules is connected in series. The device includes: a moving rod (40) provided on a main frame (10) on which sub modules (S) are provided, and moving in the direction traversing the sub modules (S); and contactors (50) provided at the moving rod (40) to be electrically connected to each sub module outer casing (1) according to the movement of the moving rod (40). In addition, a connection means (C) electrically connects the contactor (50), the sub module outer casing (1), and another adjacent sub module outer casing (1) to enable simultaneous grounding thereof. This invention connects the sub module outer casings (1), which form the converter, through the operation of the shorting device to ground the sub modules (S).
摘要:
The present invention relates to a method for producing a polyethylene terephthalate polymer having improved abrasion resistance by introducing an inorganic particle (metal) in addition to ethylene glycol (EG, Ethyleneglycol) and terephthalic acid (TPA, terephthalic acid) forming a conventional polyethylene terephthalate bond, and a yarn and a car mat produced by using the polyethylene terephthalate polymer produced by the above-mentioned production method.When the yarn and the car mat are produced by using the above-mentioned polyethylene terephthalate polymer, the density of the yarn is improved and the abrasion resistance of the car mat can be improved.
摘要:
The present invention relates to a power management system (PMS) for multiple energy storage systems (ESS) that is for integrated management of the system having multiple ESS for controlling a frequency and having a hierarchical control structure. The PMS for ESS comprises: a plurality of ESS; a local management system (LMS) for managing one or more ESS of the plurality of ESS for each local unit; an ESS Controller (ESSC) for general management of the LMS, judging a state of the LMS and determining an output value of one or more ESS in the LMS, and transmitting the determined output value to the respective ESS; and a PMS for general management of the entire system comprising the plurality of ESS, the LMS and the ESSC, judging the state of the entire system and participating in a power grid frequency control market through a grid operator contract, controlling the output of the LMS, and adjusting a control parameter for output control.