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. Tên gọi khác: Axit Frohydric, HF, Frohydric acid
. Tổng quan Axit Frohydric – HF.
Đặc tính: Axit flohiđric là một dung dịch của hydrogen fluoride (HF) trong nước, Cùng với hydrogen fluoride, hydrofluoric acid là một nguồn flo quý giá, là chất tiền thân của nhiều dược phẩm, polymer (ví dụ Teflon), và phần lớn các chất tổng hợp có chứa flo. Người ta biết đến axit này nhiều nhất là khả năng hòa tan kính của nó do axit này tác dụng với SiO2, thành phần chính của kính. Quá trình hòa tan có thể miêu tả như sau:
SiO2(s) + 4HF(aq) → SiF4(g) + 2H2O(l)
SiO2(s) + 6HF(aq) → H2[SiF6](aq) + 2H2O(l)
Bởi tính chất phản ứng mạnh với kính, axit flohidric thường được lưu chứa trong các bình nhựa polyethylene hoặc Teflon. Nó cũng đặc trưng bởi khả năng hòa tan nhiều kim loại và oxit của các á kim.
. Ứng dụng:
Lọc dầu.
Trong một tiêu chuẩn nhà máy lọc dầu quá trình được gọi là ankyl hóa , isobutane Alkylated với trọng lượng phân tử thấp các alkene (chủ yếu là một hỗn hợp của propylen , butylen ) trong sự hiện diện của chất xúc tác acid mạnh có nguồn gốc từ acid HF. Chất xúc tác protonates các alkene (propylen, butylen) để sản xuất carbocations phản ứng , mà alkylate isobutane. Phản ứng này được thực hiện ở nhiệt độ nhẹ (0 và 30 ° C) trong một phản ứng hai giai đoạn.
fluoride trong môi trường, công nghệ thay thế đang được tìm kiếm. Florua vô cơ khác được chuẩn bị từ acid HF bao gồm sodium fluoride và hexafluoride uranium .
Chất ăn mòn và làm sạch
Khả năng của acid HF để hòa tan các oxit kim loại là cơ sở của một số ứng dụng. Nó loại bỏ các tạp chất oxit từ thép không gỉ, một quá trình được gọi là tẩy, và các tấm wafersilicon trong ngành công nghiệp chất bán dẫn. Về vấn đề này cũng được gọi là BHF, (khi đệm với Fluoride Amoni), và BOE (cho Oxide đệm Etch). Nó là một thành phần quan trọng của Wright Etch và HNA tương tự (HF + Nitric + Acetic Acid) etch. Theo cách tương tự, nó cũng được sử dụng để etch kính . Gel axit 5% đến 9% HF cũng thường được sử dụng để etch tất cả các phục hồi nha khoa gốm để cải thiện liên kết. Đối với lý do tương tự, pha loãng axít flohiđric là một thành phần của hộ gia đình tẩy vết gỉ và xe rửa"sạch bánh xe" các hợp chất. HF axit tấn công thủy tinh bằng cách phản ứng với silicon dioxide để tạo thành các florua silicon khí hoặc hòa tan trong nước. Quá trình này giải thể tiến hành như sau:
SiO 2 + 4 HF → SIF 4 (g) + 2 H 2 O
SiO 2 + 6 HF → H 2 SIF 6 + 2 H 2 O
Bởi vì khả năng hòa tan oxit sắt cũng như silica-chất gây ô nhiễm, axit HF được sử dụng trước khi vận hành nồi hơi sản xuất hơi nước áp suất cao.
Ứng dụng phá đá
Bởi vì khả năng của mình để hòa tan các oxit, axit HF là hữu ích cho việc giải thể các mẫu đá (thường là bột) trước khi phân tích. Theo cách tương tự, axit này được sử dụng trong macerations axit để trích xuất các hóa thạch hữu cơ từ các loại đá silicat. Fossiliferous đá có thể được nhúng trực tiếp vào acid, hoặc một bộ phim cellulose nitrate có thể được áp dụng (giải thể trong acetate amilic), tuân thủ các thành phần hữu cơ và cho phép đá bị giải thể xung quanh nó.
Pha loãng axít flohiđric (1-3% khối lượng) được sử dụng trong ngành công nghiệp dầu khí trong hỗn hợp với axit (HCl hoặc acid hữu cơ) để kích thích sản xuất của nước, dầu, và các giếng khí đốt đặc biệt, nơi đá sa thạch được tham gia
Acid HF cũng được sử dụng bởi một số nhà sưu tập các chai thủy tinh cổ để loại bỏ cái gọi là bệnh từ thủy tinh, gây ra bởi axit (thường là trong đất chai được chôn cất tại) tấn công các nội dung soda của kính.
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* All updates after 7 p.m. should be downloaded on the app store, but those are exceptions to the normal policy.
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High performance audi stolen sydney thief evades police in chase
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A Melbourne man has been caught stealing a stolen vehicle, leaving it in a ditch, in NSW's northern Sydney.
Key points: The stolen car was spotted on the side of the road, just outside the suburb of Monaro
No-one was hurt
Police found it in a ditch and arrested a man, who was wearing a white T-shirt, jeans and sandals
The car was stopped just outside the suburb of Monaro on Sunday morning, with police hoping he would be able to turn the stolen vehicle over.
But in a police interview today, he refused to answer any questions and did not explain why he had stolen the car — a 2007 blue Toyota Corolla.
In one version of events, he described himself as a middle-aged man, with a "small build", and said he did not feel he had to answer any more questions.
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He admitted the vehicle had been stolen, saying he had been away on holiday.
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"If I was a burglar... I would've found a way of stealing this vehicle without being caught."
Officers interviewed the man on Tuesday but in that interview he refused to give evidence and said he would prefer not to answer police questions.
He also refused to reveal how many kilometres he had driven or give details of his criminal history.
It is understood he had no previous convictions, and the man had been living in Monaro since 2007.
The car was reported stolen on May 22 in Monaro, NSW, and police are attempting to trace it.
They were contacted on Tuesday to check its status after being tipped off by a friend.
The woman who reported the stolen car said she saw two people get out of the car and her husband heard the crash and a crackle.
"He looked over at my husband and he said you can't be talking."
Topics: law-crime-and-justice, crime, stolen-vehicle, accidents---other, sa, adelaide-5000
First posted
* Normal weather warning to end Tuesday
The NWS's National Weather Service office has issued a National Weather Service Bulletin to warn residents that the skies around New York City could become clear of fog Tuesday morning.
Residents should not go indoors unless there are no clouds in the forecast, and stay inside at all times. Fog can cause lighthearted damage, especially to people living in neighborhoods that are particularly sensitive to fog.
Fog can be a serious threat to people and property, especially if it comes out of the north and becomes severe, particularly in parts of lower Manhattan, the city's financial district, including around Lower Manhattan and Long Island City.
Get local weather in your inbox with FOX 5 Weather Stations and FOX 5 app. Download the app for Apple and Android
* All updates after 7 p.m. should be downloaded on the app store, but those are exceptions to the normal policy.
New York City Fire and EMS tweeted Monday morning that it has taken the unusual step of opening its "Blueshift Emergency Response Center" on Manhattan's East Side to provide shelter to victims of Hurricane Sandy.
The facility is located at 545 N. 2nd St., in the upper-midtown neighborhood of Brighton Park and has "prepared for emergency responses," fire officials said in a posting online.
The blizzard warning will have ended Tuesday, but many residents are still waiting for a response.
Some have reported being unable to get out of their homes or walk from their cars as thick cloud cover has formed over some areas of Brooklyn.
"The water in Long Island City is probably going to be so thick in terms of the fog, it's going to be very difficult to even see through the blizzard fog," said Frank Gossage, president of New York Communities For Health Improvement, whose organization has offices in Manhattan. "You'll be stuck in the fog and that is going to cause problems."
On Tuesday, a blizzard warning in the Northeast was put in effect for an extended period, affecting most of New England and parts of the Northeast. The warning is in effect across all levels of government from the federal level on down to the state level, but the effect will be even stronger in areas with high concentrations of snow and ice.
A wind warning for parts of West Virginia and Kentucky is in effect, and a second storm watch was issued for parts of South Carolina.
A National Weather Service warning was also issued for northern parts of Michigan, which includes the Upper Peninsula.
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High performance audi stolen sydney thief evades police in chase
Updated
A Melbourne man has been caught stealing a stolen vehicle, leaving it in a ditch, in NSW's northern Sydney.
Key points: The stolen car was spotted on the side of the road, just outside the suburb of Monaro
No-one was hurt
Police found it in a ditch and arrested a man, who was wearing a white T-shirt, jeans and sandals
The car was stopped just outside the suburb of Monaro on Sunday morning, with police hoping he would be able to turn the stolen vehicle over.
But in a police interview today, he refused to answer any questions and did not explain why he had stolen the car — a 2007 blue Toyota Corolla.
In one version of events, he described himself as a middle-aged man, with a "small build", and said he did not feel he had to answer any more questions.
"I don't know that any police officer would've put their boots on me and forced me to answer any questions...and then if I did I would've had nothing to say," the man said.
"I've only been to NSW once in the last 10 years and this was the first time I have ever been stopped by police. It was bizarre, at first."
He admitted the vehicle had been stolen, saying he had been away on holiday.
"I've just got it in the hands of the dealer as I've got no business in the area," he said.
"If this guy hadn't put it in a ditch I would've had no choice but to surrender it.
"If I was a burglar... I would've found a way of stealing this vehicle without being caught."
Officers interviewed the man on Tuesday but in that interview he refused to give evidence and said he would prefer not to answer police questions.
He also refused to reveal how many kilometres he had driven or give details of his criminal history.
It is understood he had no previous convictions, and the man had been living in Monaro since 2007.
The car was reported stolen on May 22 in Monaro, NSW, and police are attempting to trace it.
They were contacted on Tuesday to check its status after being tipped off by a friend.
The woman who reported the stolen car said she saw two people get out of the car and her husband heard the crash and a crackle.
"He looked over at my husband and he said you can't be talking."
Topics: law-crime-and-justice, crime, stolen-vehicle, accidents---other, sa, adelaide-5000
First posted
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